[nccrutch]

I just noticed the cam orientation line on the new PSE Mach X. Seems like a good idea for all manufacturers. I also like their line on the arrow shelf used for centershot reference.

 

[Deezlin]

Yeap, I have been doing it for a long time. When I get a bow, I use a lacquer pin and a thin steel pocket ruler. I lay the ruler on the surface of the limb and then mark the cam where the ruler touches the cam. I do this in a highly visible color. Usually, silver on a camo bow or black on a bright finished cam.

I also turn down the limb bolts and mark one side of the bolt, so I can count turns easier.

Later on, if I find I like the cam rotated differently than when it cam, I can remove the lacquer with lacquer thinner and redo the mark. Most manufacturer do actually have some reference for their cams. It may not be a mark. Center shot reference would probably be a good idea.