OK, never mind. After a *lot* of digging on the site, I've figured out that I don't have a 412VS-T: my 412 slant cabinet is actually a Spider 412 Cabinet, also called a "stereo" cabinet. It only comes (came) with rubber feet, but replacement rubber feet don't appear anywhere on the line6 site as something I can order. Must not be much profit for line6 in that level of customer service. :-( I'm going to replace 'em with Fender or Ball heavy duty casters from MS, GC, etc. Time to get out the drill.
