I’ve been trying to find out what works best when trying to check the fit while fitting the feet to the top of a bass. I’ve tried carbon paper, which seems hard to get it to stay put. Haven’t tried lipstick or anything like that that yet. Bought some china marker, which is basically a wax pencil but it seems a little too hard for me to feel comfortable using it on most things. Just wondering what others use and where you get it!