Replacement Jaeger Clock Fitment

[AFPU]

I am after some guidance on fitting a replacement wind up Jaeger clock into my dashboard.

When I acquired my 1937 Rover 12 the clock was not working, so I had been in the look out for a working repalcement; which I have now acquired. My current non-working clock does not have the winding/adjustment mechanism attached, so will come out fairly easily.

However, my replacement working clock has the mechanism attached. So I am wondering if this needs to be removed, and if so how, and whether it can be fitted into the dash with it still attached? Having never fitted one I am open to advice and guidnce on how to go about it.

I posted the same query on the Rover P3 and Running Board Facebook page and got a number of some what conflicting responses (i.e. the mechanism unscrews...if so how; the mechanism can be removed my pushing in a pin....if so where; and it will fit with the mechanism attached).