The flywheels
Three flywheels to make: brass, aluminium and stainless. It’s a simple task so I didn’t take too many photos.
And lastly, a note on the springs
You can forget all the fancy stuff, I ended up manually rotating the chuck and advancing the slide. The springs were actually quite tricky.
I made the first ones to minimise the pressure (and thus friction) between cylinder and body. But I found that the cylinder lifted off at angle, jamming the pivot pin. They were alright at 5psi but not at 20psi. So I had to experiment to get a spring that worked at 20 psi and still allowed the engine to run at 5 psi. Anyone got a use for a small box of springs?