I'm sure this is a stupid question, but I got a CLOHE cable release adapter for my REX-4. It fits into the M-STOP-P channel just right, and I can operate the plunger and make the camera go, but what stops it from falling off the camera? Is my eBay purchase missing a part?
EDIT:
Okay, does the top piece with the slot turn 90 degrees to hold it in? Very tight on my camera...