I'm sure this isn't an original idea, but for those who haven't thought of something similar already...
Much as I like them, the clip-on Scotty downrigger releases go on/off the downrigger line a little too easily - I've lost several. Today, the downrigger stopper slipped up the line - causing the release to hit the pulley at the end of the boom during a retrieve. It popped off...into the drink. Buh-bye $10.
The fix: A simple safety clip. Just tie a short piece of line to the swivel on the release clip, and attach a snap swivel to the other end. Snap the snap swivel over the downrigger line. Kinda hard to see, but you get the idea...

Much as I like them, the clip-on Scotty downrigger releases go on/off the downrigger line a little too easily - I've lost several. Today, the downrigger stopper slipped up the line - causing the release to hit the pulley at the end of the boom during a retrieve. It popped off...into the drink. Buh-bye $10.
The fix: A simple safety clip. Just tie a short piece of line to the swivel on the release clip, and attach a snap swivel to the other end. Snap the snap swivel over the downrigger line. Kinda hard to see, but you get the idea...
