G'day

Here is a question I'm sure some of you might find strange but if even
just one person can answer it I will be happy!

I have a HJ tonner and I'm wanting to remove the rear view mirror, it
is on a stalk that goes up to the roof and not onto the windscreen.

There are no screws that I can see holding it and I have tried sliding
it off but can't, does someone know how to get it off? I'm assuming it
is just a normal stock standard one so someone must know.

thanks
Dean.