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Author Message   John_shriver Tinkerer Username: John_shriver Post Number: 40 Registered: 12-2006 Rating: N/A Votes: 0 Posted on Sunday, February 22, 2009 - 06:52 pm:    On the IIIa, remove the cap at the left end of the rangefinder. There is a small bit of spring steel, rotate it so it's not caught in the slots. Don't let it "get away"! Now pull the metal wedge, and then the mirror. New mirror goes with the silvered side facing in. Replace wedge, spring, and cap. If you can't re-adjust vertical RF alignment to match, you need to shim the top or bottom of where the mirror sits. A fresh mirror makes a huge difference. Cannibalizing old Japanese rangefinder cameras for a mirror is another approach. I have a gold plated one that I used a little while, one image is blue, the other gold. Different.