the small knurled "knob" on the shutter cock lever on a copal 3 I have fell out. I can't identify how it was secured initially, there are no threads. The knob itself, though there is a miniature hole in the back, doesn't seem that it would have taken a screw. Was it simply "spread" into security in manufacture with a tool that puts pressure in that hole, or was there indeed some part or screw in the back to hold it in place?
Thank you
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