Push On Shaft Retainers; Removal Of ?

I have a metal cart where the two tires are held onto the shaft using these "push-on" type of fasteners.
The kind with the prongs all the way around so they can move in only one direction.
Like as shown if you visit the Starlock site. > http://www.bakfin.com / (see half-way down the page)
Horrible method of holding the tires on, as there is no good way to remove them to put on a new tire, easily.
Anyone have any hints on how to get these things off of the shaft ?
Thanks, Bob
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