Well iffy but with some telephotos the optic module unscrews from the focus mount, if yours does and it is not too tight you can unscrew it and thread the mount pushing the follower in as needed, and you will have to do the same for removal.
The canon(s) have (have) a roller
The FSU cameras are not compatible with lots of LTM lenses
Some of the canons dont like J12 or collapsibles, the M5 and CL ditto
For the last 13 months I've only used a Kiev (or Contax), apart from folders, Fed's, Zorki's, M2, etc.,... and a digital to record dismantle sequences...