bingo.
i draw a line with a sharpie and write on a piece of tape "mount point".
i also write tip and tail on tape pieces so the newbs know which way is up.
never ever ever had an issue.
if the tech gives me the "im not retarded" look, i explain that i have had some skis absolutely butchered.
majority of time they appreciate the simplicity and not having to determine what the fuck you want done to your skis from a scribbled on shop work order.