I don't have the issue of not being able to tighten loose trucks as all of mine are secured with a threaded screw into a solid block of Plexiglas glued to the underside of the floor.
Ah
I toyed around with magnets. I tried one gluing a washer to the floor and glued a 2mm magnet to one door and added a strip to the edge of the other door. After doing one, I decided it was just easier to just add the strip and add some friction to the one door.
All in all, it's been fun doing my own cars. I bought the hot wheels ones and converted them although I didn't move the trucks outward, I extended the coupler mount like the flyer ones. Too bad the center beams weren't good candidates.
Brendan
