Wait, do you mean that you(r partner) undoes the knob and the clamp bit doesn't release?
Exactly.
I’ll have a look at the inner surfaces of the clamp and see if I can smooth them off a bit.
Here it is.
Thanks, the clearance is probably borderline according to those diagrams and the inside surface is a bit chewed up, so will order a replacement plate.
@M_V started
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Exactly.
I’ll have a look at the inner surfaces of the clamp and see if I can smooth them off a bit.