This is the snapped drive shaft from the Tomkat. It’s a bit of wire rope 2.6mm in diameter.
Since I didn’t have any of this handy (I suspect an old bike brake cable would yield some) I’ve had to improvise. The first attempt is in the photo – an inner from a model aircraft “snake”. This crushed when the grub screws were tightened.
My solution is to use a bit of metal drive band (it’s a tightly wound spring) with a bit of wire in the centre. This hasn’t been tested on the water yet but bench testing shows the drive to be stronger than my grip on the end of the shaft with my fingers.
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