Hi. I need to replace a bearing cartridge on a sugino cbbf-103 square taper bottom bracket. Its on the fixed cup side. Contacted sugino about it to find out how to replace the cartridges and as the don't recommend it, they're not willing to tell me any information on how to replace them ie cartridge size bearing rating etc.

Does anyone out there have any experience with this part that could shed some light on this?

Cheers
Slim