I find it more cumbersome and less monkey proof than scribing the arcs because unlike a jig that moves the guides in equal increments, you have to reset those brass guides to get a second mark on a...

Agreed. I will add, that I've found that you get good accuracy if you do the line crosses
~ 18"-24" apart--depends on the straightedge length you use--and then double check along that length with...

^^^I'd vote to leave it alone if you have enough threads in the ski and its not interfering with the binding.

Btw, on metal tops, don't be afraid to punch a fairly good dimple in the top with...

^^^Agreed Terry & telemike. I find this way to always be the fastest and most accurate. Scribing arcs, measuring and all that stuff is time consuming and prone to error. The nice part about the INCRA...

I used to have a small cheap square that I drilled holes in for pen...worked ok for a while. Then I finally broke down and got one of these for $13...works great--you just need a fine point pen...