[QUOTE=metroac;2066194]There's a company called Pro-Mold that makes recessed one-screw holders with UV protection for many different-sized cards. I saw T206, '48-50 Bowman, '51-52 Bowman, '52-56 Topps on eBay this morning. Has anybody tried these?[/QUOTE

I have several of them and they are great holders. Their quality control lacks a bit. Two of the holders I ordered had broken tabs out of the package.