I attempted a repair on an AI copy of this lens (which was pretty much identical to Rick's K writeup) and I found it very difficult - the focus ring collar could not be removed, with no amount of heat, acetone, IPA nor tapping would free it. Exactly the same with the lens objective and the front optical group. For the barrel I had to file an angled groove (so the front face was still intact) to get enough clearance to get a driver onto the screw head and to remove so I could at least service the helicoids.
What I also found - at least with this copy - was the focus is heavy. once the lens objective is put back into the barrel; after I serviced it was smooth but as soon as the lens objective is inserted (which was a very snug fit), the focus action becomes heavy but not binding.
On a FB, one lens tech said all copies he's worked on have been tight. Its a shame that this lens is glued like this as its a nice little lens.
