here's a tip for hard to find screws - try the lamp repair section. I found 8-32 x 1/4 thumb screws which fit my old federal tin can enlarger that hold the lens board in place.
I also found some other odd size flat head screws in the hard to find items in hardware which fit in screw holes long missing. 6-32x 3/8.
I am on the hunt now for some tiny screws for the calumet metal 4x5 to restore it to perfect condition.
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