Sliding Hook Ruler Jack A. Loganbill 04/2004 48” Ruler b a Prepare two blocks (a), approx. ¾”x 3” x 6”. Prepare two spacers whose width = width of (a) and length = (length of (a)/2) -width of ruler and thickness = thickness of ruler. At bottom center of one (a), counter bore to accept 3/8” hex nut. In same (a), drill 3/8” hole through block. Epoxy nut in counter bore. Glue four parts (a) and (b), with ruler in place. Thread the threaded knob through block to lock ruler / block in place. Sliding Hook Ruler Jack A. Loganbill 04/2004 48” Ruler b 3/8-16 threaded knob a