Gearboxes almost ready now. Have not tried them out with the motor yet, but they turn freely by hand. Had to do some modifications to the original design, namely introducing thrust washers to reduce gear rubbing on the side plates. Looks good enough though, considering its a precision part manufactured using hand tools a lathe milling combi would have come very useful! will have to wait a bit more for that...
Will try to find some time tomorrow to couple the motor to the box and give it a go...hoping it will stay in one piece - fingers crossed!

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