Hey everyone,

I've been moderating this sub for some time now, and decided it was about time to restructure the rules of the sub with an aim to make r/SeikoMods more welcoming and useful, especially for beginners, while preventing the subreddit from becoming an advertising channel or unregulated marketplace.

What has changed?

Useful links are allowed

You may share links to suppliers, products, tools, tutorials and other resources when they directly help answer a question or add useful context to a genuine discussion.

Please explain why you are recommending the link. Dropping unexplained links repeatedly may still be treated as spam.

Buying and commission requests remain restricted

Posts asking where to buy a completed watch, requesting a builder, seeking commissions, offering prices or inviting sellers to make contact are not allowed.

These posts regularly attract unvetted sellers with unknown quality, inflated prices and, in some cases, no reliable product or service at all.

Please use our pinned supplier and resources guide as a starting point.

Clearer rules for businesses and self-promotion

Businesses, professional builders and makers are welcome to participate as members of the community.

If you mention a product, business or brand that you own, work for or otherwise benefit from, you must clearly disclose that relationship.

The following are not allowed:

• Using the subreddit mainly to advertise
• Repeatedly posting your own products, shop or social accounts
• Soliciting orders or inviting people to DM for prices
• Affiliate links, referral codes or undisclosed promotions
• Pretending to be an independent customer
• Replying to buying requests with offers to build or sell a watch

A useful technical contribution that includes an honest disclosure is different from an advertisement.

AutoModerator should be less frustrating

The previous setup automatically removed every post and comment from accounts less than four weeks old. This caught many genuine questions and helpful replies.

New accounts can now comment normally. Only posts from extremely new, low-karma accounts will be held for moderator review.

AutoModerator will focus more on suspicious sales language, affiliate links, repeated external links and obvious promotional activity. Questionable content will generally be sent for review instead of being deleted. If this starts getting abused however, i'll tighten things back up a bit.

Reporting should be clearer

The reporting options now make it easier to identify:

• Spam or advertising
• Undisclosed commercial affiliations
• Buying, selling or commission requests
• Harassment, hate or personal attacks
• Off-topic content
• NSFW or graphic content
• Photos taken while driving
• Stolen or uncredited work

These changes are intended to encourage useful knowledge-sharing without giving commercial accounts free rein to advertise.

Please take a look at the updated rules. If something is unclear or produces an unintended result, let us know by sending the moderators a message.

Last updated: October 2026

Welcome to r/SeikoMods!

Whether you're building your first watch, upgrading an SKX, swapping a dial or working on your tenth custom build, this thread is here to help you find the parts, tools and information you need.

Our previous supplier and resource list was put together around six years ago. Since then, the modding community has grown considerably, with new suppliers, more movement options and a much wider range of aftermarket components available.

This updated guide brings together established suppliers, newer options and useful resources for anyone interested in Seiko modding.

A quick note about suppliers: Inclusion in this list isn't an endorsement or guarantee. Suppliers, ownership, product quality and customer service can change. Do your own research before purchasing, and check recent community feedback.

If you've had a particularly good or bad experience with a supplier, or know of somewhere that should be added, please share it in the comments!

1. Seiko Mod Parts Suppliers

These businesses specialise in aftermarket watch components, including cases, dials, hands, bezels, crystals, movements and bracelets.

Established suppliers

Additional suppliers worth exploring

The following businesses also appear in more recent modding discussions or offer relevant watch-building components.

This isn't intended to be an exhaustive list. Some smaller manufacturers and independent dial makers produce exceptional components, and we'd love to hear about them.

2. Watchmaking Tools & Equipment Suppliers

Good tools make an enormous difference when building or modifying watches.

You don't need an expensive professional workshop to get started, but using the right equipment helps prevent scratched dials, damaged hands, broken stems and other avoidable problems.

Many mod parts suppliers also sell basic tools and beginner kits, so it's worth checking whether you can purchase everything together.

What tools do you actually need?

For a typical NH35/NH36 watch build, consider starting with:

• Movement holder
• Hand-setting tools
• Hand removers and dial protector
• Fine watchmaking tweezers
• Precision screwdrivers
• Case-back opener
• Spring bar tool
• Crown stem cutter and fine file
• Loupe or magnifier
• Dust blower and cleaning putty
• Finger cots and a clean working mat

Depending on your build, you may also need a crystal press, case holder or other specialist equipment.

3. Budget-Friendly Parts & Secondhand Components

You don't necessarily need to spend hundreds of dollars on your first build.

There are several alternatives to purchasing everything brand new from specialist suppliers.

AliExpress

One of the most popular options for inexpensive cases, dials, hands, movements and other modding components.

Quality can vary considerably between sellers. Check recent reviews, product photographs, measurements and compatibility carefully.

eBay

Useful for replacement parts, donor watches, used components and occasional bargains.

Secondhand Mods

Offers new and pre-owned components from different manufacturers, including OEM Seiko parts.

r/SecondhandModParts

A community resource for buying, selling and trading watch modification parts.

When buying secondhand, always check item condition, seller history and the community's trading rules.

4. Helpful Video Tutorials

If you're new to modding, watching somebody complete a build can make the process much easier to understand.

These tutorials cover some of the most common tasks.

5. Prefer Reading? Guides & Resources

Sometimes a written guide is easier to follow, particularly when you're trying to identify the correct parts or troubleshoot a problem.

6. Parts Compatibility: What Beginners Should Know

One of the most common mistakes when starting out is assuming that all Seiko-compatible parts are interchangeable.

Unfortunately, they're not!

Before placing an order, make sure you've checked:

• Movement compatibility: NH35, NH36, NH34 and other movements have different requirements. GMT builds in particular may need additional clearance.
• Dial diameter: Common sizes include 28.5 mm, but your case may require something different.
• Dial feet: Check their positions against your movement and crown orientation.
• Hand compatibility: Confirm the correct hand sizes and whether your movement requires additional hands.
• Case compatibility: A case designed around an NH35 doesn't automatically accept every other movement.
• Crystal dimensions: Diameter, thickness, profile and gasket compatibility matter.
• Bezel and insert fitment: SKX007, SKX013, SRPD and other platforms may use different components.
• Crown and stem compatibility: Check the crown tube, movement stem and case arrangement.

Beginner tip: For your first build, buying a case, dial, hands and movement from a supplier offering clear compatibility information can save considerable frustration.

7. Seiko Modding Communities

Looking for inspiration, feedback or help troubleshooting a build?

A community member, u/Haveblue1, also previously compiled an extensive spreadsheet of modding suppliers and resources. It's another useful reference, although individual listings may need checking.

8. Help Keep This List Updated!

This resource is intended to grow and improve with the community.

If you know of a supplier we've missed, have discovered a broken link or want to share your experience with a business listed above, please leave a comment.

When recommending a supplier, it would be helpful to include their website, what they specialise in and where they're based.

We'll aim to keep the list updated as new information becomes available.

Please remember: A supplier appearing here doesn't necessarily mean they're endorsed by the moderators or the community. Always do your research before purchasing.

Happy modding!