u/FinancialRepair4741

I am trying to identify the shown fastener, so they can be replaced. They have been used to fasten a thick plastic sheet (which needs to be replaced) to the inside of a screen door frame. The fastener does not go all the way through the screen door frame, only through the attached surface. The cap is a little loose on some of the fasteners - enough to allow them to rotate. They seem to be like a very wide, very shallow capped blind rivet.

Any assistance is greatly appreciated...