M3 Eyepeice Protection

When I had my M3 I found a corrective diopter used for I think $25. It was one of the newer kind with rubber cladding, not the old type which was metal and serrated around the edge. I knocked out the lens from it and it made a very good protector. Unlike the others, it screwed into the eyepiece and didn't get knocked off going in and out of the bag.
 
eyepiece protector for M3

eyepiece protector for M3

I have a circa 1957 M3. A standard rubber hose washer fits over my eyepiece and is thick enough to protect my glasses from the metal rim. Slight trimming of the washer is required.
 
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