Carving a little detail in the wheels. I took measurements from the drawing and transferred them to the model with a compass...
Beveling the edge of the tire. This is the first step in giving it roundness...
This step was difficult because the wheel is so small, trying to cut a circular V-shaped groove...
Using a file to smooth the knife-cuts...
Using a small round grinder mounted in a hand drill to make an indentation in the center of the wheel...
Here is another grinder profile to refine the V-shaped channel. I am not spinning the grinder like a drill, but rather using it like a file, making light passes over the rough areas...
Almost but not perfectly round wheels...