One was to modify the center beam frame so that the trucks can rotate enough to negotiate O-27 curves.
The other was to remove the Weaver coupler and mount a Kadee coupler onto the flat car.
The trucks are surprisingly free rolling. One of them rolled off my desk onto the floor, where it did a sudden disassembly.
A small rod that allows the side frames to rotate and keep all wheels firmly on the track exploded off the side frame.
Maybe I can glue it on. I asked Gemini how to glue acetal homopolymer (polyoxymethylene, or POM-H).
Gemini said, "Yes, acetal homopolymer (POM-H, or Delrin®) can be glued, but it is notoriously difficult to achieve a high-strength bond with conventional adhesives due to its low surface energy and high solvent resistance. Cyanoacrylate, works through a rapid chemical reaction called anionic polymerization. The bond is incredibly strong due to molecular forces and also due to mechanical binding."
Looking at the break, I see lots of surface roughness. Maybe that will help the bond.
When I bonded Delrin discs at work, I used a two-step glue. Step one was to coat one side of the discs with a chemical that broke the surface Delrin molecules. According to the instructions, breaking the molecules exposed electrons to share with the glue. They look like they are already broken in the image above.
Edit 1: added "in the image above" to clarify where I see broken molecules.
