Lift Arm nut

[and11200]

Somehow or another, the lift arm nut came off and I need to get another one. I tried putting a washer on there but it popped right off. Any ideas on where to go about getting that part or any ideas on how I can fix it?

[Rob B (shoebox)]

Rocker arm nut? You need the correct nut. It is a "prevailing torque" nut. That means it is designed to put tension on the thread and not vibrate off. You should be able to get one at a dealer or parts store. I hope the ball washer is still there.