Bench Grinder Tool Rest Angle Gauge

Gauges for setting or measuring the tool rest angle on a bench grinder. There are two sets, one for a 6 inch wheel and one for a 8 inch wheel. The original one is the 6 inch as that is the grinder size I have. I scaled it up by 133% to get the 8 inch version. In addition, you will need a carriage bolt and a knob. The 6 inch version uses 1/4" and the 8 inch uses 5/16". The knob I use is https://www.thingiverse.com/thing:2718994.