Originally Posted by
Donjohnson24
Thanks for the response - I would expect that there should be a groove in the plastic mount for the bearing that would be exposed when the bearing is pushed further into the block, but if the manufacturer would not bother to fit a snap ring, it is unlikely that he would have cut the groove. I should add that I have a CNC3 3018 Pro machine rather than a 3040 so there may be a difference in this version.
It seems that some green Loctite should do the job for me.
I have to smile, though, at your and other posters references to finding snap rings in the local hardware shop. That may be the case in the US, but hardware shops in the UK have largely disappeared, being - partially - replaced by what you call big box stores.