"Highlandman - you are right - hammered does have lots of wrist action"

I'd agree with JiK - the fingers give a lighter faster flick compared with the wrist. Must spend more time on my triple stringer. I need to get some more hammers, especially lighter ones balanced in sets of 4.

It's a matter of technique though. If you want to play '2 hammers in one hand' style, you will need to rotate the wrist somewhat more than when using only one, though. BTW - 2 hammers per hand is quite common on xylophones nowadays.