Changing out the antenna mast

[TheInterceptor]

Evening all.

So its that time in every AU's life where the antenna has failed to go back into its hidey hole. My one wont go up or down at all, just has the motor whirring away when it does.

After having a few searches returning nil results...and at risk of asking a daft question, how do i swap out the antenna mast!?

I have a new mast sitting here ready to go in but i'd just like to know how to get the old mast out and new one in.

Does it come out of the top? (under the black plastic guard peice)
Do i have to pull the whole unit out from under the guard??

Thanks!