Need help identifying a replacement coupling sleeve for an older Kaya Cast vacuum casting machine

[u/Jonathan_783]

I have an older Kaya Cast jewelry vacuum casting machine, and the flexible coupling sleeve between the motor and vacuum pump has broken.
I’m trying to identify the exact replacement part or a compatible sleeve.
What I know:
Machine: Older Kaya Cast jewelry vacuum casting machine
Part needed: Flexible sleeve that fits over and connects both metal hubs
The sleeve has internal teeth that engage the external teeth on both hubs
Tooth count: 8
Metal hub measurement: 22.78 mm
Total coupling length, including the gap between the hubs: approximately 1½ inches
Gap between the hubs: approximately ¼ inch
The original sleeve is broken, so I cannot measure the intact sleeve.

Does anyone recognize this coupling style or know the correct name, part number, or a supplier that sells replacements? Thank you!!!🙏🙏

[u/John_Hasler]

I suggest that you consider replacing the entire coupling with a different, more common type such as a Lovejoy coupling.

[u/Jonathan_783 → u/John_Hasler]

Just ordered it I hope this works thank you!

[u/Lt_Col_Ingus]

Last comment link didn't work. You're looking for something like a PR77, R77 coupling sleeve. You can find them on Amazon or... you can update it to a Lovejoy coupling like the other guy mentioned.

[u/Jonathan_783 → u/Lt_Col_Ingus]

Thank you!!

[u/John_Hasler]

This may be what you want.

https://www.centurytool.net/PR_77_JB_Industries_Coupler_Flexible_Section_Only_p/jbipr-77.htm