The manual says to insert the pedal return springs into a hole at the side of the motor mount. I did this first, but was absolutely unhappy with this. Very hard to put the spring into this hole and if you need to vary the spring position you need a row of holes in the mount. So, inspired by postings on the helpful Murphy Builders list, I decided to install a metal tang into the screws in the mount. The tang was fabricated from 1,5 mm metal sheet.