https://www.thingiverse.com/thing:4641270

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I skip the center line altogether. I just use calipers to measure from the template centerline to the ski edge on both sides, making small adjustments moving the tape until the measurements are even....

You have to remove some boot sole rubber. Not uncommon with all the different boot/binding combos out there.

I take volcanos off with a hammer and chisel. A couple quick whacks and everything is flush.

Ok, so you've found the center line, that's easy to do a number of ways, but my experience is that when I actually draw the line between the two marks it ends up being slightly off. In other words,...

I no longer bother with a center line, as it is very difficult to do perfectly. Instead I use digital calipers to triple check the distance of each potential hole (black dots on paper templates) to...