Quote Originally Posted by bmac
Looking to buy a spanner wrench for working on my lenses (attaching retaining ring to lens board tightly).

Which one is the right size?

I've got Copal 1, 3 and Compur 0 shutters.

You would be a fool to get one of those pieces of shit. Do yourself a favor and call SK Grimes and ask them to sell you one of their wrenches. About the same price as these and 1000 times better. I have one I got on feebay and it is the best I have ever had, and belive me I have tried them all....