No prob. I haven't used the stew mac one so i can't vouch for it. Also, i wouldn't waste money on a cheap rotary tool either.. Get a good dremmel tool. The reason is because cheap ones often do not have a perfectly centered collet, thus the bit may have a slight wobble.. I have two other rotary tools by diff brands and both are much less precise than my dremmel.Unfortunately the cheap Baroque string action gauge is on order already. Is the stew-mac one better ? Haven't ordered the cheap 6" rule or rotary tool yet. May I ask where you got your machinists rule ?