A simple two fingered hook and a mark on the string. I found the hook at Lowes by their rope. I dont use it much anymore because I found that it didn't make much of a difference for me, however, I shoot three under and tiller all my personal bows even and split fingered bows an eith positive tiller, but I don't even think that makes much difference. Just my two cents, and the only reason I do it different is to keep the bow from dealing with different releases.