scientific is that. but a blade hit by a file to get a general angle and then on paper wheels, without all the time and effort of all this other stuff has never failed for us.

As to some things like checking heads during season etc... it goes to be said for years good bowhunters know to check and touch up as needed ever since I was a kid. And we've known not to trust factory heads at all.

Good selling video though if you can convince the folks they need all this your pocket book gets fatter.

Same tools have been on the market for years differing versions and we tried them. Yep they do work. At a cost of time. A good file and paper wheels are so much more efficient.

Caveat you do have to be able to know what you are doing with them.

We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....