The ultimate best gadget I ever found was a large paddle lever that screwed into the socket yet was still relatively compact, so you could simply flick it with a fingertip to fire. It didn't isolate vibration the way a cable release might, but for short handheld exposures it was the bomb and it didn't seem to really impart any vibration anyway. I think it was made for Schneider in the press camera days although there were no markings.
Alas I have never seen another one and it was sold with the lens that it was fitted to. Dumb of me, it was a great design that maybe SK Grimes (or our friends in China) could have redone.
The idea of Loctiting a short Gepe extension cable into your shutter is probably the best way to preserve the threads and give yourself a nice clean thread that is much easier to mount a cable release into than the side of a shutter. Even for lenses on flat boards.
The Linhof quick release is nice too except I never liked dealing with the special tips they require. But Linhof cable releases are really really nice.
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