I don't own a Stu Mac Jig, and I don't have a table saw The few necks I've made, I've always resolved to use a CNC machine to scribe fret positions on my fretboads before using a hand saw (like a Japanese thin blade) to cut fret slots. This has been hugely successful. However, it is a pain to get access to the cnc, and ask a favour every time, etc. Does anyone use a caliper to mark out fret positions? I've not been able to print fret positions on paper accurately, after numerous tries, it just ain't accurate enough, hence why I opted for the cnc route. (I saw by hand because of the tiny bit requirements needed to cut by cnc) It got me thinking. How did Leo and his buddies cut frets, and to what accurately. I mean these days, guys will let you believe that 100th of a mm accuracy is needed or at least more tha a 10th of mm, but back in the early fifties (let along the 20's or earlier), I'm sure they didn't even get accuracy of 1/64 inch when cutting slots. Obviously they used some jig, but with mass production done by hand, not fancy cnc to cut slots for the masses, or Stu mac jigs on a table saw (which I doubt has 1/64" accuracy), it couldn't have been all that accurate. And the bigger question is, how inaccurate should the fret slots be before our ears picks it up? What's your thoughts?