I had my synergy2 come out of my hands while swinging and hit the backstop which caused a big chunk to break off. I fixed it by drilling a couple holes in the piece that was still attached to the bat and screwing a couple small setscrews in. They need to stick out a good amount though, they will act as rebar basically. I then took a 2 part epoxy (similar to mighty putty) and worked it so it was close to the size and shape I needed, stuck it on the knob and smoothed it out a little more. After it hardened I sanded it down, sprayed some black primer on and now you would never know it was broken.