As has already been mentioned by strugz, I have had some issues with my middle bit....

I'll echo what he said though. Forget about changing the handle. After i broke mine beyond repair I decided to open her up and see how it was all put together. The molded handle is glued on to a fibreglass core. Its no that thick in the center so carving would probably do more harn than good. Plus, if the grip comes loose on the core the locking mechanisn wont function properly.
Give it a go first, contact speak aside (coz i cant do it with this stick, but hey I cant cant do a whole load of contact anyway

) this is a dream of a stick to spin with.
and if you see my middle bit....