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The motor brushes seem to be a pair of stiff wires
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That pretty much explains the intermittent grinding sounds: the drum would rotate normally until the swirling water swept the pen housing into contact with the drum
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I fully expected the cells to be crap and they were.
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The final result has a bit less travel than the (undamaged, original) shutter button in my DSC-H5, but it works perfectly.
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I started with the button… which is chromed plastic, nothing too fancy, and not at all hard to machine.
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Good news… * apart from some scuffs, the camera still works * he managed to find the shutter button * and the button bezel * and the spring!
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That’s what I get for applying too much torque to the blade, I thought…
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Much as I expected, there’s just not enough energy in a 5 V / 200 A resistance soldering unit to weld 8-mil nickel strips to AA cells.
The Smell of Molten Projects in the Morning 