Date Thursday, 9 June 2022, at 1:26 p.m.
It'll work for any width. You just use a very light touch and slide the slide back and forth on the wheel. Slow up in the center or the edges, what ever it take to grind a straight line. What I especially like about the arm is that it never moves. You can endlessly check your progress and go right back to the EXACT place you were before.