Ductape
Addicted to ArboristSite
I take a black magic marker and mark the bars on my saws. Make a cut, turn the saw sideways , eyeball my next cut and so on. Years ago I also tried the plastic rods that go on the bar stud, but they broke so easily. There are times I've been tempted to try a mingo, but since they don't make a wheel for 20" wood..........