I unscrewed the 3 Phillips screws on the back of the dryer controls housing, then it folds forward for access to each control switch. the old one popped out, and I swapped the wires using a needle nose pliers, one by one, from the old switch to the new switch. The part was an exact fit, and popped right back into the housing. I screwed the 3 screws back in, pushed on the new knob, and it looks and works like new !