CMD10 z-axis fine adjustment

[Jon RidingParticipant @jonriding]

I've recently taken delivery of a CMD10 mini mill. Generally please with it but I can't see how to engage the fine adjustment on the z-axis.

There's a catch on the side with two positions: out for Normal => and in for Fine Tuning <=. When pressed in it engages with the wheel on the front of the head and as the wheel is turned the catch turns.

The puzzle is that no matter how much I turn the wheel I can detect no adjustment, fine or otherwise, and can only set the head position using the wheel at the top of the column.

Can anyone tell me what I'm doing wrong?!

[Jon RidingParticipant @jonriding]

[Jon RidingParticipant @jonriding]

Here's a pic of the catch:

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