Step 1: Open the hand controller by removing all eight Pozi-drive screws from the rear side (not Phillips, but a Phillips screwdriver will work if you are careful).

A. If you are patient enough usually this can be done without disturbing the rubber around the hand controller. Otherwise, you can rip off the entire rubber cover and re-attach later using super glue or E6000 Quick Hold glue. It is recommended to keep the rubber intact.

B. Then unscrew the gland at the base of the hand controller to allow the cable to move freely

C. Once this has been done, both sections of the hand controller can be separated.

D. Then the old keypad can be removed by first sliding the locking mechanism on the flex cable (see Figure 2 & Figure 3) and then prying off the old keypad from the front.

E. Once the old keypad is removed there may be old glue left on the front. This can be carefully scrapped away using something like a plastic spudger tool or a plastic sticker remover.