I mainly engrave jewelry, so one problem I've repeatedly run into is finding a way to get my engraving perfectly centered in a circular area. Alot of engravable charms and pendants are round and roughly coin-sized, so even a small deviation from the center is very noticable.
My question: does anyone know a good way to pinpoint the center of a circle? I usually end up taking 15 minutes adjusting and estimating and still sometimes the engraving looks off center.