> To summarise the best advice: make a lensboard out of an OM body cap
> using a retaining ring. Any advice on making the 39mm hole?
I did this about 20 years ago for an old Componon enlarging lens. The
hole wasn't quite 39mm but the same process should work. If I remember
correctly, I used a two pointed compass to locate the exact centre of the
cap. From that centre point, I then enscribed a circle (39mm in your case)
using the compass. I then drilled many small holes along the inside edge
of the circle so that I could punch out the plastic centre. From there
I used a file and sand paper to get a nice smooth circle the exact size.
Today I would probably use a dremel tool to make the holes and smooth the
edges.
-mark
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