another way to check a pinched nock ...is to go out and pick of a set of speed nocks, they are to my limited knowledge the smallest on the market. simply pull your old nock out of one of your carbon arrows and replace with the speed nock....if the problem is fixed when you re-draw then you have you answer = pinched nock. if so, go get a d loop put on at a pro shop....or as GMMAT stated take it to the shop.