[slotloco]

Everything Alan just said - plus for anglewinders, remember that as the pinion moves down the motor shaft, it is getting closer to the axle shaft and therefore the spur teeth, so you have to take that into account, and remember that if you have space, and you start with a pinion/spur combo that is a little loose, you can move the spur out, and pack between the axle bush post and the spur with spacers, until you get a good mesh.

Something I got taught fairly early on, was to stick a ciggie paper between pinion and spur, push them tight together, fix, then rotate to spit out the ciggie paper and the mesh would be about right. Very unscientific, but I often still do that using some really think plastic - like an old single use plastic bag. It certainly gives a reasonable start point.

Alan - I keep meaning to ask - are you the guy from the Rockingham club with the long hair ?