Here is the one I use
https://haconten.appieshost2.com/app...IE:prodSW7500+
I have tried most of the buttons out there and this one fits your thumb great even with gloves on. It seems to be brutally consistent...
The only thing is did was take the ring off and put a c clip on it so it catches the aluminum...
http://pictures.aol.com/galleries/dr...5Fd3Ig=/large/
IMO this is the best one going...