Antique Screen/Storm Door Inserts
I have a screen door exactly like the one in the picture below, and need help finding a part which helps hold the inserts in place! There are two methods my door uses, one is 'spiders' whose screw can be loosened and then rotated to allow the insert to come out...and the other is actually inside the door itself: you turn a slotted screw, and this causes a rectangular metal piece to swing out from inside the door frame to fit into a corresponding slot in the insert.
My problem is, I am missing one of the rectangular metal pieces and need to find a replacement. Does anyone know what these are called, and where I could get one? I have tried various searches involving 'screen fasteners' etc., and all I turn up are either screen hangers for storm windows, or screen door latches, neither of which I need.
Here is a link that might be useful: