It appears they the thread on the knob is too short but can't see a reason for that and nothing seems to have broken off.Bit of a mystery.
Replacing the stay doesn't seem to be the easiest job either as the lower end seem to be bonded to the window.
Ian
Strange. How about trying to file down the plastic on the stay and the knob a couple of mm each to allow the male thread to reach the female thread?
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