[Mazda]

Nonfractal

Good stuff ! How does the DIY balancer work ?

Steve,
Take a G clamp, put a button magnet at each end.
Take an axle  and grind one end to a point with a grinding wheel.
Slide on your component (wheel or gear) and lightly fix into place with its grubscrew.
Spin the axle by hand and adjust the spacing so that the axle spins freely with minimum friction.
When you get too close, the axle will jump from being held at the pointed end to the stub end.

Once set up, spin the axle and observe as it slows down.
Identify the heavier part of the diameter and use a weighting material, tape or blue tac on the opposite side.
Slowly but surely, you reach the point where there is no perceptible inbalance.
An alternative to weighting material is to grind away material from the heavy side of the component.

I demo'd this at the start of worldwide slot car chat #45. Have a look,  The video makes it clearer.
https://m.youtube.com/watch?v=70PjXvq5mkQ&t=6037s

Alan
I use a similar system using a micrometer to balance Magnatraction armatures.