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evoluent verticalmouse2
ive switched back to a normal mouse for a couple of days & i've been in pain... if only i could be assed to plug it back in again....
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I have this mouse and like it, but I don't really use it anymore because its kind of bulky for quick motion and precise clicking while multitabling. It might be perfect for OP's problem though.
My current mouse, and personal favorite, is:
