I began to get annoyed by the little clicking sound made when the dive extension of my EZM3 would tap against the clasp of the watch. So I took a page out of the recurve bow hunting community and decided to add a "silencer" to the watch.
All you need is some loop side of "hook and loop" and something to cut it with (knife, scissors, laser, or whatever).
Get your plain loop (not sticky back or anything) Cut about a 18mm by 25mm rectangle. (Or whatever size your clasp is)
Insert it into clasp loop side out slide it a little under the dive extension pin to hold it in place.
Done! Works a charm.
This being the only Sinn I have I am guessing it should at least work with other Sinn dive extension if not other watches that have similar style extension. Probably best to measure your clasp pocket.
Also, hopefully it being synthetic material will help keep moisture from sticking around, but keep an eye on it to prevent any rust or grossness from building up behind it.