I have a box car and a caboose that wobble when they get past a slow roll. The trucks don't have screws they are the snap in type so I can't tighten  them. What would cause the wobble and is there a fix? I was thinking maybe an out of round wheel? They don't derail they just wobble.

The wobble is due to the truck mounting hole being larger than the truck snap-in pin.

The only real solution is to replace the trucks with the type that mount with a screw. There are two basic methods for doing this:

1. Use nested styrene tubing glued in place to fill in the hole. Then tap for a 2-56 screw, and use a screw to mount the truck.

2. Fill in the hole with 4-minute epoxy, then let it set over night. File the bolster smooth, drill a #50 hole, tap for a 2-56 screw, and use a screw to mount the truck.

Len