Hello, I recently was given an enlarger (Beseler 45mcrx) and have a schneider-kreuznach Componon-S 5.6 135mm I would like to use with it. The lens diameter is to wide to fit in the lens boards that came with the enlarger. Can anyone tell me what size hole I should be looking for when looking for a lensboard to mount this in? Any ideas where I could get such a lensboard? Thanks!