Wiper spindle (shaft) seized

[Dirty Rooster]

In the excellent 940FAQ there is this ;

[Response: Richard Klasic] It's hard to describe but the wipers are mounted on the shaft going through a bushing. After years of usage. this bushing becomes dry and corroded making the wipers move more slowly until they freeze completely. You need to take out the shafts and polish them gently with sandpaper and then lube the shaft with a grease that doesn't go away with water. You can always unhook the motor from the ball joint to the wipers and see if it runs fine. I bet it does. This was the case on my wipers on the old 760 I had. It really squeeked when running. And after 15 minutes hammering at the tap with a plastic hammer and lot of WD-40 it finally came loose. After my operation WOW the wipers were dead silent and swept like lightning over the windshield.

I need to do the same. I've bolded my problem.
I do not know how to remove the shaft from the alloy bushing.
The whole assembly is out of the car,
the wiper motor itself is removed and works.