How do I get a sagging post out of a trolley base?

How do I get a sagging post out of a trolley base?

If you work a lot with Danish trolleys, you will probably recognise this. You're rolling a heavy, old trolley full of shelves into or out of the truck, or over a little threshold in the warehouse or greenhouse, and suddenly a post sags through the cart.
Besides the very tedious job of unstacking the plates, comes the next challenge:

How on earth do I get that sagging post out of the trolley base! Sometimes it works out and the post can be pulled out with some tugging and wiggling, but often the post and trolley opt for a more permanent union....

This is what the Post puller is made for!

Stangentrekker

The lever action allows you to pry out the post with little effort. The Post puller is indispensable in every warehouse and in the standard equipment of every driver who drives about with Danish trolleys. 

This is what we're talking about: