Help!!! I recently bought a tac 15, and started having arrow problems right off. The nock is being shoved up into the arrow. I read another post where someone recommended using bulldog nock collars. These also start to swell out after a few shots. I even tried glueing them in. I contacted pse tech support, but they only recommended glueing the nocks in. They seemed to be very uninformative on the problem. But they did offer to replace the bad arrows, but that is very little comfort, seeing how my arrows are rapidly failing.