Well I purchased one of amiadfilter's recast buckets off ebay about a month ago. Mine, however, did not look as bad as poor deadbolt's, and I can say that it is infact "mystery" size I measured it myself to make sure.
Not to say that there aren't any problems with the casting, mine does need to be sanded around the bottom edge, and the inside is just pure fiberglass. There is no solid coating other than a layer of black primer inside. But the helmet is a solid workable peice without any holes and mine came with all of the parts including the stalk. I have started to paint it ESB style by hand and from the outside with the paint on it it looks pretty dang good. I would post some pics but my camera's usb cable is missing.
I think amadfilter my have read deadbolts post and all of your replys because mine is a much better project helmet than his. It was still pricey at $180 bucks (including shipping). I know I got burned there, but what are you gonna do right?
I will probably get another bucket later but if I can manage to turn this one into the helmet I want then I know my second will be a sinch.