I bought an FK12 bearing mount off eBay recently, and I'm damned if I know where the little threaded nut thingy should go
Haha, I think you bought that from me actually?? The little threaded nut is supposed to thread onto the end of your machined ballscrew... thats if you have it machined that way. The other end should be FF12 (floating) and this just has a single bearing with the ballscrew retained with a circlip.


They are INT 30 taper but the flanges is smaller and thicker than the standard INT 30 tooling
So how do you come by the tooling to fit properly?? Ahh, yes a laser cut spanner is probably much easier, now to CAD....