Hi Steve,
That slug is .530" in diameter but your input got me to checking on slugs for zapping. Carlisle has a line of slugs that are longer and made for the purpose so I'll be getting some........thanks!
I'm using Riggen wheels. I've modified them a bit to include some rim detail and opened the ID up to the same size. More on this later.
The fronts are for 3/32" axle:
The rears are 1/8" and needed a reducer for 3/32" axles:
Fresh Riggen orange rubber:
The motor brace soldered to the axle tube but not to the motor just yet:
Fass 45T spur and Sonic 9T pinion:
An orange REH Jet flag attached with a self tapping screw (a nut is still a ways off). Brady's car in my reference photos has brass clips for the lead wires so I used that simple and clean method also:
The double orange lead wires are tinned and bent into a little loop that fits over the buss bars:
Getting close....