I have a whammy rest and I put the NAP prong style covers on my whammy and they slide on just fine, even with the angle of the prongs. They worked alot in dampening the noise when the arrow comes across it too. I have mine set to where if you press the prongs down you have to closely look to to see light between the shelf and the prongs. It is very close, but there should be no contact. The rest is so fast it doesnt have to be as close as some drop ways and there will still be no cantact.