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I slightly bent the aperture pin. Then, removed mount to attach a new adapter that required removing the mount. The screw holes were misaligned and in the process pushed the pin way down. Now, the aperture won't stop down at all. And, started unscrewing rear element with my fingers, couldn't get out very far, till it wouldn't budge, tried to re-screw it with my fingers. Now the rear element is a little misaligned, so lens is a little soft.
Yes, I am technically inclined, but I have no lens tools, and little lens disassembly experience, and I love my Rollei too much to become a Frankenstein test subject.