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Matthew,
Hard to get a good shot, but here is how mine is set up although perspective is skewed.
Reed switch ~ 7 mm sq, attached to track cover.
Magnet ~ 7 mm sq double sided to ring.
Vertical distance ~15 mm.
I took the equator to be the centre of the wheels, which agrees with drawings.
Neil.
Last edited by Auster1b; 19-10-2015 at 10:26 PM.
Reason: added note on equator
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