Corner Brackets for the 84-091M

Hello, I want to buy 4 screen roller 1'' steel wheel product code - 84-091M.

However, I need to replace one of the four corner brackets that the wheel assembly snaps into....and am hoping by the pictures you can help me get the corner bracket out and put a new one in, so I can put a new wheel in there. The tit on the corner bracket broke.

The other 3 corner brackets are fine, but need 3 wheel assemblies.

I look forward to finding out how to remove the "looks like a die casted corner bracket with a little tit to snap the wheel assembly on.

Also, I tried loosening the screw opposite the corner bracket (has a hole on the side of the screen door, but this would help dislodge the bracket?

Thanks,
Tony

One more photo...a good shot of the wheel and bracket.

Thanks,
Tony