rubber might work if you got a piece of very thin neoprene .... or cereal box cardboard .... or the thin plastic like used in notebooks or photo albums

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 & Rust-a-holics Unanimous parking lot