The images show the screws and parts I had laid out as I took the unit apart.

If you have a glue gun handy you may wish to glue the potentiometer wire back into place. I didn't have a glue gun but found the nut seems to keep the potentiometer in place anyway.

Remember to be careful when putting the pedals back on the rails. There will be a small opening for the cable to sit between the two bits of plastic. You will need to have this in place correctly. (Unfortunately I didn't take a picture of this).