Blkdodge: I found on my Bighorn of the same vintage, that the clamp nut NEEDS these screws, as the nut is set down on the junction of the sink and the sink edge surfaces which is NOT Level. The nut is just really holding on 1 side, and using the clamp screws to support the other (higher) side. While you are under there (use a piece of foam or a pillow for your head as you lay on your back), take the hose fittings apart and remove the flow restrictors inside for better flow in the faucet.