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Repair Contax IIIa (and IIa) shutter


New Member
Dear Contax people,
Recently I purchased a IIIa from August 62 (last production month) and unfortunately it seems like the second curtain rushes after the first one resulting in half the picture black with 1/1250 sec and about a third of the picture unexposed with 1/500 sec.
I found a YouTube video of a IIa disassembly that shows a little screw on the right hand of the shutter that seems to control the shutter speed but I have no idea if I have to screw it in or out and how far.
Could anyone who ever repaired a Contax please help me?

Thank you!