Feickert Protractor - anyone use one?

there is no divot, but there is a circle at the proper cross .  I did replace the pointer at the end of the beam with a  laser pointer.  with the protractor the feikert adjust+pro and my ears i am confident that i get very accurate cart alignment.as with most things, the more you use something the easier it gets.

I also have the metal Dennesen. I prefer the Feikert. As pryso identified, finding the pivot point can be daunting.
the Linn Ittok is a prime example. On mine it is just at the tip of the bottom leg of the k on the name badge. there is no actual identifier. changing the pointer to a pinpoint light beam helped to better see the spot. also the Feikert beam has a printed scale in millimeters starting at the proper 180 mm to345 mm. for someone who swaps carts/tonearms/ has tone arms on pods or likes to try different effective lengths or curves, the Feikert is a good tool.