installing 84-050?

A quick learner from Bethesda md says:
I recently bought twenty 84-050 rollers for use by my condo owners from your company.I need help with their installation..My screen used four rollers. I don't understand why the rollers have two positions(closed and opened)for starters. Second I need some instructions on how to install them.Thanks, Bob V T
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Dave Sr. from SWISCO responded:
I believe these rollers are installed at the corners of the patio screen door. If I'm not mistaken, the screw that holds the screen door frame together, called the corner screw, needs to be removed in order to replace the old roller and then, of course, reinstalled to hold the new roller in place.
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