This should be a very simple, mechanical operation, but, it does not work. I bought this used many years ago and recently put it on the tracks for the first time. It jerked nearly off the track. I pulled it apart and this is what I discovered. I looked at the K-line service manual and the diagram showing the truck and the actuator lever is unclear. Here's what I have. Any suggestions would be welcome. i don't know if the actuator lever should be straight, bent and whether it should be on top of the cam or below it. It was below when I first put it on the track but it seemed to drag on the middle track. I repositioned it on top of the cam but then the Actuator would bind the ratchet wheel.