I made a simple gauge using 3 screws (#6 x 1") and a small piece of wood 3/8 x 3/8 x 2". Drill three holes 3/4" apart for the screws. Put in the screws all the way and file the ends (not the heads) flush (with each other, they should stick out of the wood at least 1/2"). To use, get the screws flush on a flat surface. Then place on string and adjust the center screw until it stops rocking. 1/8th turn of a screw is about .3 degrees of downbearing (if using #6 32 threads/inch screws). -Mark
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