Step 4: A Little Surgery
After the cut is made everything should fit back together with the wires coming out of the controller. Now if you bought the T8H screwdriver you can put all the screws back in place, but if you didn't i recommend putting some more user friendly screws back instead.
I also recommend trying out the controller here to ensure there are no soldering mistakes and that everything works, otherwise take it apart and double check everything. This is were allot of patience is needed.