I've tinkered with my Heliar. Disappointed. After many attempts, it still wouldn't line up perfectly (from 5mm to the right of top dead center initially to 1mm to the left of t.d.c. after tinkering), nothing like the spot on accuracy of my FSU lenses.
Fortunately, from where I bought it there is a 7 day exchange policy. So, I am going to take my R3A (along with the voigtlander adapter) there and try out god-knows-how-many lenses till I find one that lines up, or I die of frustration, disappointment and/or exhaustion.
p.s. I found that even my FSU lenses don't line up when I use a no-name L-M adapter. But since the industar doesn't have a built in shade like the Heliar, I am guessing that I won't causse vignetting. Worse case, the adapter is too thick/thin I would only loose infinity focus and probably the would not be able to use the distance scale, but the lens would still focus correctly via the rangefinder. Am I correct to assume this?