I installed the grips on the sticks today. I used yellow heat shrink on the 6 wires all the way to where they attach on the grip head. A little bit of a process getting all the pieces on and the wire threaded through the stick. The wires have to route out the side of the stick because of the way the stick attaches to the control horn. I used a grommet on each side to further protect the wires from potential chaffing.
The stick head with the switches mounts on the top of the stick, there is a spacing tube that goes over the stick (this is to accommodate smaller diameter sticks) which plugs into the stick head. This all has to be held in place in order to drill a hole through the head, spacer and stick for a rivet that secures it all in place and prevents it from coming off or rotating. Once the rivet is in place, the foam grip can be slid into position. It is very tight and takes some pushing to get it seated.