I’m overcome with joy, as my first wheels emerge from the RTV mold and get attached to axles (nails). One of the wheels contains BBs (gun shot, see first photo) covered with resin and another wheel contains a copper plumbing pipe thin section covered with epoxy. While not substantial, this metal adds plenty of weight or heft, as does the thick nail (forgot type of nail but large one used to nail studs).
For the sleeve, I’ll be using copper gas lines, which fit nicely with the nail.
Pin vice aids the drill, which otherwise would slip around and be off center, resulting in wheel wobble.
Next step is building a bunch of cars.
HOwdy,
Who says one cannot reinvent the wheel?? Great ideas. I am looking forward to the cars you are going to build. Very nice indeed. 
Zak
thanks, Zak; still sort of experimenting. I toyed around with filling a mold with solder. It kinda splattered around (the RTV mold held up just fine). I may try melting a large block of solder in a steel chalais and dumping it in to see what turns up (hey, people have made frogs from solder so what the hey)
F J & G
Looks great, lotta people don’t understand a bunch of work gos into remaking parts from small to large. But I see the boss did not show up for picture taking again!?
Oh and the nail I think is a #9 D for framing out a house etc…
how many BB’s to a wheel?