I'm finally starting to piece together the CB550 I bought over summer. I bought a start button and spring for a CB500 off a parts fiche b/c there wasn't one on the fiche for the CB550. So that solved half of my dilemma. Now I know how to mount the button and the retainer with the green/red wire but I don't know how the yellow/red wire mounts to complete the circuit when the button is pressed. I know how/where those pieces mount on the other half of the hand control. I just don't know how the original setup looked to complete the circuit. It's a 74. If anyone has theirs broken down and can snap a pic of the inside for me I'd really appreciate it. I've got to figure out some way to steady the wire over the button.