Some leathers i fragged didnt like the toothpick stuck through them and just split around the toothpick and fell off before they ever attatched to the rock. Tried rubberbands to hold them but if the tension isnt right sometimes they split and fall just like the toothpick. Best luck for me was to use some plastic netting stuff that I could wrap across the frag and glue to the rock. Enough tension to hold it on the rock but also has some give to it so that the frag can expand and retract without much restraint. Not sure what the stuff is called but I got it from walmart. Bag of marbles, and this stuff is the actual bag the marbles were in.