@DB - The thing is, all this design means I can forstall the point of actually winding a pickup - that's the part I'm least confident about . But great idea about the flux capacitor, I reckon I can waste another month on that too .

@Wierdy - yeah I had a similar thought too. Just thinking through how to make sure the fixed radius feeder always turns. There has to be a reasonably simple way? More thought required.

cheers,
Gav.