Recently got an Aaton LTR 7 in great shape, came with Nikon F and PL mounts, both of which work great with their respective lenses.   I have a bunch of old M42 lenses that I used with my K3 and I want to try them with my Aaton. I bought an M42 -> PL adapter but the only lens I can get to fit in the grooves of the adaptor is the Meteor 17-69mm; the other lenses are too wide at the base to fit. I've tried a couple different M42 -> Nikon F adapters but the flanges are off because I can't fo