I have an old RCBS vibratory case cleaner. It was made in 1989. The nut holding the lid on the bowl is a rubber encased nut that, in my opinion, is superior to a wingnut and rubber washer. Mine has about had it. I called RCBS and they said all they carry now is the wing nut. Any idea where the original type rubber encased nut can be found? Is it a normal stock item somewhere?