Ok guys maybe I should have said I am only talking about wood props, and the cutting tools have come a long ways from when I started balincing them about 40 years back. frist balancer was a bubble unit

I am not a fan of APC's except on the smaller engines, and never realy balenced them I did check a few. have given up on most other plastic props and have disposed of all of my small engines. so I am thinking 18 inch wheels and larger

But it is like I said it is just how close you feel you need to be and I like to soft mount my bigger engines just to get some of the natural vibration out of the air frames.

You do have to keep the du-bro unit clean, and if used correctly it will do a good job.
we all have to do what works for our selves

Cheers