MI-250 GO-TO
There is a New Question and Answer MI-250 wiki available on this site for MI-250 users
There is a new Question and Answer Gemini wiki for users of the Gemini-1/2 mount controller.

Bearing Replacements for older and newer MI-250 mounts.

This parts are possible bearing replacements that HorizonalMike identified on the MI-250 users group as a possible replacement for the worm bearing in his 2006 model of MI-250.
All the Bearing for the MI-250 came from American Bearing Works In El Dorado, Ca.
Phone (916) 933-2450 Fax (916) 357-7187
ask for Ken Sykes
Old Worm Bearing      
D(ID) D(OD) B(Width) Part Number
8MM 19mm 6mm SS698ZZA7K58GPRJSRL
New Worm Bearing      
D(ID) D(OD) B(Width) Part Number
8MM 22mm 7mm SSMER228
The other 2 bearing used in the mount for the RA and DEC thrust bearing are part numbers 60052Z and 60122Z