struts; the bessa II cant use the same struts as the bessa I because the whole lens unit is moved to focus on the bessa II, whilst the bessa I turns the front cell to focus. the strut system on the bessa I is good, its more modern as well. the strut system on the bessa II, if unworn or undamaged should present no problems though and locks in place quite well. you may be able to wiggle or move it a fraction by grabbing the lens with your hand and wiggling, but like the doctor said to the guy that complained that his arm hurt every time he did 'this', the doctor said 'well dont do that then!"
All things being equal (not too worn) out of the two systems the Bessa II that moves the whole lens to focus gives better results. possibly you could show a picture of the camera and its struts? there are a few tell tale signs that show possible problems..
winding knobs: somehow, i dont think this is your problem.
the actual knob on top the bessa II does have a bit of play in it, although all this movement does not transfer to the wind shaft, and film spool. the bessa 1's knob has less wiggle as you have said. ...but, this makes little difference in the end because the spools themselves have much more wiggle, and can move backwards easily a few mm, i find the modern plastic spools sometimes dont fit as tight as some older metal spools so if you wanted to ensure no movement (or less movement) you could try these in the take up chamber, or use a piece of foam or material to make a tighter fit i suppose. at any rate with all this wiggle in the spools i have not noticed a problem...it is simply a matter of winding on just prior to taking a shot, the pressure plate keeps the film flat. it may be worth checking the springs in the take up chamber that grip the film and in general keep or hold the film in place or rolling backward or unwinding.
you would have to have a significant amount of film bellowing (not flat) to cause unsharp pictures at f8 across the whole frame.
its difficult to give a difinitive answer to what is causing the problem without knowing (and seeing) every thing that has been done to the camera and lens. it may be a series of small errors made while putting it back together and adjusting (did you do this yourself?). e.g. have the lens been replaced correctly (or original matched sets), shims for shutter etc, any damage to front standard or struts, rangefinder adjusted correctly, pressure plate as it should be...then, only because the question has to asked, is if you are veiwing only after scanning and if scanner is focused correctly, or there if there is film curl while scanning...i have only scanned minimal pictures but this is area i need to fine tune as nothing i scan seems to come out as sharp as the actual negatives or wet prints i make
i cant see the pics very well on my laptop screen (my PC in for repair--urrg!) but if i had to say, i would say the lens simply arnt colminated properly
