To get the screws out i am having to take the drive apart so I though folks might like to see how the inside of these one way pulleys look.
The assembly removed from the treadle
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the outer wheel removed showing the inside
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and here is what it turns on. This is brilliant... The springs push the small posts against the inside wedging it unless you turn the other way, then the springs compress and the posts move out of the way...
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A small disk separates the two pulleys,
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and here is the last shot. here you can see the second pulley set up the same way but still engaged
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(Yes, it went back together....)