The most likely cause is (as has been pinted out) that the shaft is binding
on the panel, due to a too small or not-quite-aligned hole.

Loosen the screws, and see if you can then double click, if so drill out
the relevant panel hole.

If it is really a bent shaft, have it removed and straightened by your
nearest Cambridge dealer who can reseal the instrument after reassembly -
the cost will be much lower than damaging the PCB.

"Walter Weir" wrote in message
:

The control knob on my Cambridge 302 is slightly bent. It rotates OK
but will not "double click" - it sticks when pushed in and has to be
pulled out. Is it safe to try to bend it straight? Any advice on the
best way to do this?

Walter