this help? there should be screw holes where the retainer goes [yes, centered], it squashes the seal some what into the corner against the pinch flange .... note there's also small clips at the corners

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