One-Way push on the post Fasteners

Anyone have a good method of removing these one-way, push on the post fasteners? That's not a 1/4" nut. I need to paint the plastic case, maybe it would be best to just mask the dial glass for painting. This is a Motorola 55X12A. Anyone have a set of ivory knobs for this model?

Majestic Radio model 2A50-F Directional Speaker

Just wondering if this Majestic radio model 2A50-F, circa 1939 is supposed to have this directional speaker housing? Looks original but could have been added by someone at sometime. Interesting gimmick. Anyone have a photo of this model radio? It's in Rider's Volume 11.

Thanks

Danny in Cleveland