Drilled holes in left and right side control stick to attach both stick grips. Passenger stick grip was quick since it only has one mounting screw and two wires to route out to wiring terminals. The pilot stick grip was a little more work in that it had two mounting scirews and 7 wires that routed thru control stick exiting out the front bottom of the control stick and then feeding over to the bottom of the pilots seat where the wiring terminals will be installed to make all the connections.