ragg, just re-griped NP carbon. one side when finished

other side

If you do it yourself, and haven't done it before, the new grip will soak up the glue fast, so you need to be on your toes.
Make sure the join is on the out side of the boom, this prevents future hand grip and harness lines ungluing from joint if on inside.
If you get the new grip from Ian at Sail and Windsurfing centre, he will give you some tips on how to fit the new grip Hydrodynamix kit is about $30.
For mine, next time will give it to somebody who knows how