i taped the entire backside of the wheel and used a sharp pencil to outline the template chris supplies. with the template held by one thumb and finger on the wheel i gently scored the outline. then each time pluging deeper into the rubber. once the outline is cut i made cross cuts inside the outer score and then just started peeling it out with a small screwdriver. as the hole gets bigger its easier to see what needs to be removed. the corners were the hardest to cut as i was scared the knife would slip as i was applying pressure to cut and slice the wheel. slo and steady is the key. remember the inside part of the arm is all rubber and thats were the slot needs to be cut to allow the wiriharness to pass thru. the outside of the arm has the metal at the bottom so you slice to the bone there and work to the inside. i spent prolly 1 to 1 1/2 hr on each side fitting the paddle and trimming fitting and trimming. maybe 2 hrs marking the tape and looking at it remove and try again to get the best distance angle and fit. add a dozen calls to chris for support and i did it!!