Kitchen Faucet Repair: Loosen a stuck screw on a single-handle faucet A single-handle ball-type faucet If the Allen screw is stuck, or if you strip it so it won't come out, remove the cap with the handle still in place. You can't grab the flattened edges with the handle in place. Let's start by going under your countertop and turning off the water to your faucet. Next, we'll remove the cartridge (s) by taking off the faucet's handle (s). Using a 3/32 allen wrench, you will undo the set screw then remove the dome cap by unthreading it counter clockwise.

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