step 2 Slide the washer into the screw and insert it in the blank that sits on top. The washer is optional, but it does protect the blank from getting marked when tightening the screw. step 4 Insert a wrench over each end, at both the head of the screw and the nut. Twist the wrenches in opposite directions at the same time to tighten. step 6 After tightening, cut the remaining length of the screw away. step 8 The finished piece will be secure and ready to use.