sounds like something a PO added for something they thought was a problem [irritating] - the only factory material I've seen in a lot of different doors is a heavy tar paper like material, mostly stuck in spots on the back of the removable panel, never anything thicker .... the best way to lessen the door closing noise is to coat as much as reachable of the inside surface of the skin with an undercoating material

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics