Looks like 3T Vola, and you have the wrong screw in the wrong place, and you've probably lost the pressure plate, parts 15 and 16 in the diagram It's anticlockwise to clamp once you have the right parts in the right order.
Amazing, that’s it, thanks.
I did think it was odd the extensions needed a hole drilled in them to be held in place….
@fredtc started
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Looks like 3T Vola, and you have the wrong screw in the wrong place, and you've probably lost the pressure plate, parts 15 and 16 in the diagram It's anticlockwise to clamp once you have the right parts in the right order.