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The screws act as recoil pads adding to the rather small surface area of the recoil ring. The brass screws will not compress any more than the recoil ring will. Both the recoil ring and the pads can wear over time but with the increase in surface area the wear will be slowed. These pads do exactly what the steel shim is designed to do which is to deliver the shock of firing to the frame. However, no adjustment to nipple length is required since these pads are spaced between the nipples. Steel screws can be used but adjusting their length to match the height of the recoil ring will be difficult.
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