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You made that, damn impressive
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Only from bits of the original thing left over. All I did was source the Cubic Zirconia stones (remarkably cheap, they worked out at less than a tenner for 2000 of them with postage etc.) and get the oil the right thickness. Oh and it was a present for SHMBO.
We are drifting a bit, back on topic, if 30s is acceptable how about a clock movement, two magnets on the second hand drive and a couple of reed swithes.