Tonight, I got out one of my Proto 1 engines and discovered that the rear coupler had exploded; the knuckle is flapping loose, there is a polished plunger and a light spring. I've searched the MTH site, the OGR Forum and the web, but can't find a parts view of the coupler to see how it goes back together. Or, is it easier to just buy a replacement coupler from MTH?
Thanks,
Davin