Storm window springs

A home owner from USA says:
I purchased replacement parts for my storm window and am having an issue. The part numbers are 91-056, 91-057, & 91-003. The problem is w/ 91-003. The nylon piece is too large to fit into the available hole. Is there a modification you would suggest to either the piece or window?
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Paul from SWISCO responded:
Sorry to hear you're having trouble! I suggest maybe using an awl to open up the hole, or you could try to file down any burrs on the nylon retainer that might be preventing it from locking in.
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