Wing (vent) window felt replacement

[Otis Campbell]

Is the vertical window felt, that guides the front of the windows at the rear of the vent window, riveted to the vent window frame? If so, what size are they? Are there suitable alternatives like POM rivets?

 

[Slowleak]

Is the vertical window felt, that guides the front of the windows at the rear of the vent window, riveted to the vent window frame? If so, what size are they? Are there suitable alternatives like POM rivets?

That piece is not riveted, just pressed into place.

 

[Otis Campbell]

That piece is not riveted, just pressed into place.

Thanks! Mine are not budging and I wanted to be sure before I resorted to heavier methods persuasion.