David,
that certainly looks like a very viable option that should have been adopted by the Pantera designers. Too bad they did not follow Porsche’s lead
The little melted plastic bumps I created were each well under 1/16 of an inch.
The friction-fit created by just that little interference was very tight. I sincerely doubt that even if a correctly sized rubber ring could be found that it would be thin enough to actually be usable.
Larry