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@gbj_tester
One common problem when inserting cartridge BBs into older frames which have hitherto only been exposed to cup and cone is that the thread depth on the cartridge cups is greater, whereas the threads in the shell have only been chased to the depth required by old loose ball cups. As a result, the cartridge cup jams in the unprepared threads before it is fully inserted, making it seem tight when it is not yet fully engaged.