I have a tc6 I bought used.ive been having trouble getting it to act right so I've decided to rebuild it to factory setup. I noticed before rebuilding the shocks I had no rebound. I tried to set it but no rebound. I started looking and seen there is a hole in the cap.it was either drilled or came that way.not like a crack or anything like that.my question is what is the advantage of zero rebound? Most sites say start with 50% rebound.