Keith
The best camera is one that still works!
Very stiff focus is common on these Iskras ... I fixed mine by marginally backing off the four slot head screws that hold the front of the bellows in place. If they're a fraction too tight they appear to distort the metal plate behind the focussing ring binding the whole thing up somewhat. Also a drop of very light machine oil either side of this ring makes a difference ... mine started off so tight it was hurting my fingers but now is free and smooth! 🙂