Hi Max,
Pretty much what I thought, not worth the trouble. I cut the shaft off a lot of the motors so I can keep a good selection of bosses, just never know what I might need to fix something. Much easier to put them in the press and pop the stub out if I need one. I always like to keep a pile of motors because I never know what I might need from time to time
Sorry I don't have any Kirby bits.
Cheers Norm