Can anyone point me to the proper specs for a 4x4 Calumet (old style) lens board? I have a new lens to mount, and I'm finding it hard to determine the proper thickness at the edges from my old, somewhat chewed-up board (made by some previous owner). The new lens is mounted in a Copal 0, which has a much shorter flange for the retaining ring than the old Compound shutter, so I couldn't mount it on the old board even if the holes were the same size (which they are not, although close). Also, any construction tips would be most welcome! I got some thin (about 1/8") plywood last night, and did a bit of experimenting, but soon realized that in rasping down the edge so it'll fit into the bottom slot, it makes for a dangerously thin bit of plywood. Would I be better off using solid hardwood, or a glue-up of two layers of plastic (say opaque plexi)?
The hole drilling also has me concerned... I have some hole bits, but doubt very much if one will be exactly the size for a Copal #0... Again, advice on this would be much appreciated.
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