Metal pins are very stiff and sharp.

I bought this contour gauge to measure the profiles of my favorite guitar necks, for future guitar building purposes, but doubt I'm going to use it for that purpose. The metal pins are very stiff and sharp. Even after putting some oil on the pins and working them back and forth, it's still too stiff and would risk making marks on the guitar finishes. Also, be very careful about pulling the pins too far, because they'll come right out of the base. I accidentally pulled a small section out and had to feed them back in one by one. This item is probably good for laying tile or using on unfinished wood, but nothing I'd use on a finished guitar neck. I should have bought one with plastic pins.

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