I ordered a 2 1/4" standard. I'll weigh it when it comes in. I also found this info off of Dave Browns site. I'd almost bet that the Vortechs that are sold now aren't the same as the one you have. The picture I linked to at Tower shows a fairly thin wall. It doesn't appear to be even close to 2 mm thick.

I'll let you know how much mine weighs and how well it works.