It happened to me that the rubber feet of the Magic Trackpad suddenly was lost. Problem is that you aren’t able to buy them at the Apple store. My solution was simple. Get a pencil’s eraser. And cut a small slice off.
And glue tape it under the trackpad in order to see if the height of the feet is good. If it is good glue it with a small point at the trackpad. Make sure that you don’t glue too much, else the trackpad isn’t able to click. Doing this is at your own risk of course.
http://www.ebay.com/itm/141751425949?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT these will save my trackpad I hope!
I bought those and there are NOT ok. Too small for the klick move.