Paul from SWISCO responded:
January 19, 2017
Looks like this was made by a manufacturer who doesn't use a typical screen door wheel like other door companies use. It's tough to say for sure, but it seems as though you would force out the wheel by slipping a screw driver from the side and popping it up and out. It might look like the 81-228, 1-1/4" diameter wheel. If so you would drop the new wheel in and with a punch and hammer, tap in the indents to lock the wheel in place.
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