How To Use: Step 1: Unscrew the nut; Step 2: Use a hex key to adjust the to the maximum Step 3: Screw on the nut and insert the screw tap. Do not tighten the nut and keep the screw tap vertical Step 4: Use a hex wrench to tighten the screw tap, and observe the tightness through the visible hole Step 5: Tighten the nut with wrench