Just a simple question. I bought a Rodenstock Ysarex 135mm lens mounted in a Sychro-Compur shutter for a song. The glass is mint, but the shutter is junk. I opened it up to flush and lube it and a spring is broken, among other problems. I just need to know which size copal shutter this lens needs. I'm considering just buying a new one from B&H but I'm not sure if it is a #0 or a #1. I have a Calumet 4x5 camera and want to dip my toes in the large format pool. Thanks in advance.