I have for many years built up my butt caps. I take an old leather grip and cut it length wise, so that, half the sticky double sided tape remains on the cut piece and the piece is long enough to completely circle the butt cap with the cut ends mating perfectly. This gives me
a 1/2 inch wide raised platform at the butt cap end. Also, covers the points of the butt cap. Than once in place, I wrap 1/2 inch wide Johnson
& Johnson white athletic tape over the leather 1,2, or 3 complete turns, to build to the height I want. The J&J tape locks the leather strip down and keeps it from slipping. I then put on an over grip to finish. When an over grip needs to be replaced leather and tape stays in place,
allowing new over grip to be put on.
Now, I hold the racquet with the butt cap inside the palm pressed up against the heel pad. The little finger lays on top of the raised build
and does not slip off, plus allows the little finger to easily apply pressure without squeezing the grip tight. The hand is relaxed, the grip is relaxed and the ring finger is locked against the built up butt cap. The racquet can not slip out of your hand and the butt cap does not move
around in your hand. Allows that loose grip, relaxed wrist for extreme racquet head whip on serves, forehands, and one hand backhands.
For volleys, I place the heel pad on the build up for a solid grip that does not allow twisting. I play with 27.5 inch extended frames with a
342-343 swing weight, holding the racquet butt cap inside the palm actually give me a 28 inch lever.
Try it by using only a leather strip 1/2 inch wide, then add J&J tape if you want more build up. If you go to far building the butt cap, then
remove a tape wrap until you find the build up that works and feels best for comfortable play.
Aloha