My RV-6 has been flying 11.5 years and 2,198 hours. When I built it, I ran the wires for the PTT right out the bottom of the stick past the rod end bearings.
IF you are using one of the fancy grips with all kinds of buttons, you will need more conductors but should still be able to route the wires straight down to a connector then out to the panel or what ever accessory that your stick gip button operates.
This is where the models differ a little bit Gary - the 8's forward stick doesn't pull off like others, and the cross-stick weldment blocks the bottom, so you can't run anything straight down. Just thought I'd mention that so folks weren't confused...
Paul