+1 for the LimbSaver pads, with the Pachmeyer Decelerator a distant second.

If you have a benchtop belt sander (not a hand-held) I'd suggest getting a grind-to-fit rather than a Precision Fit. Reason being is that in my experience the Precision Fit's never really match up perfectly. If you do get a grind-to-fit (LimbSaver or Decelerator), throw it in the freezer overnight then install and grind it down before it thaws. This makes it much, much easier to grind down the softer compound.