^^ this
when getting my skis mounted, they are entirely taped off and i mark the exact line where to mount, i mark center and put huge fucking arrows on it to indicate the front + i write down instructions :)
make sure your instructions are fool proof, this one time i had written, mount at -3, on the marked line and the shoptech got all confused on wether or not mount on the line which was at -3 or mount at -3 of the line (-6) :P