Use Bullfrog snot? I know thinning it with half water/half BFS helps make the application more even.
No, the goal is to replace the TT equipped (grooved) wheels with plain wheels for better electrical connectivity. So no Bull-Snort needed.
samusi01: I also wondered why they used TTs on that model. I guess they wanted to make sure that this li'l switcher could pull a long train. Whatever . . .
As far as spares go, I spoke about these with Arvids (their sales/tech-support rep) and he said that they had a very limited number of spares and they went fast. They still have few coupler assemblies left.