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Control unit
I think this was a TA03 gear, which is strange, because I don't have a TA03 car. On top of it is a standard plastic 11mm bearing, which is on a screw to attach the 'motor' to the black box.

The box is a 33mm long piece of 10.5mm stripwood wrapped in styrene.

There's a 2mm backing plate, a piece of flex, and the head of the screw fixing the whole to the lift column has become a gauge.