Nano, I'd love to see a photo of your modified thumb rest!
Sure, Weeks, rubber bands work - I used them before trying the rings. But they're harder to position, have to be folded over, etc. And maybe the rounded toroid profile of the rings gives a smoother effect.
I think you misunderstand. The purpose of the O-ring tweak is definitely *not* to mute the whistle, but to increase backpressure and improve response. If anything, the whistle tone may seem stronger because it's a bit more focused.benbrad wrote:If you want to mute a whistle ...
And for a photo of the standard paper clip mute, see this:
http://chiffboard.mati.ca/viewtopic.php ... ht=#676358