tabletop controller non-slide rubber feet?

[Man-Machine]

My tabletop controller slides all over the place! I put some small clear sticky rubber feet from Home Depot but I think the rubber is too hard to work. I think it's made to have heavy things on top to get a good grip. My controller is about 15 x 10 x 4 with 1/4" wood so it has a decent weight but not the whole thing touches the table surface, just the bottom of the two side pieces like this ->  I   I  <- I put a lot of these stick rubber feet but its no good...

Any suggestions of good non sliding rubber feet?? Thanks...

[Turnarcades]

There's a few types available here in England, but I wouldn't know where to try in the US. I use a decent set, which are designed for footing on cupboards, lightweight chairs etc, which are a really soft, 'tacky' rubber so prevent slippage, with a simple screw centre.

[Tahnok]

Maybe something like this:

http://www.rockler.com/product.cfm?page=653

[kelemvor]

I'd go to a craft store like Michaels or Joanns.  I'm sure they have things like that.