Pin was slightly bent on first use. Not the end of the world, but I was disappointed. In general, I successfully pushed out two rivets. When forging rivets on the new main link, the calibration tool broke on the first rivet. Parts of it flew wildly through the garage. I only found two parts out of three. It seems that the design of this nozzle is too small and flimsy for the task. Tomorrow I will send it back for a refund and then try Motion Pro Jumbo. Wish me good luck! I've seen several references to a faulty drive pin. The instructions don't say so, but the bolt threads need to be lubricated before use. Any oil or anti-stick will do. Reducing thread friction reduces the force required, likely saving the drive screw every time.