i know seth posted his build a little bit ago and looking through some articles and all I see some people tend to use air/hydro, and some people tend to use just a normal mechanical setup.
whats the difference other than you physically having to pull the bar around, is it a better bend with air/hydro? reason i ask is i found a plan on ebay (link below) and i was thinking of possibly building it. i don't want to build it though if it's going to be some shitty design that ends up loose as far as exact bends and duplicating them are concerned.
http://cgi.ebay.com/Rorty-No-3-Tube-Bender-Construction-Plans-Manual_W0QQitemZ330186003346QQihZ014QQcategoryZ42147QQssPageNameZWDVWQQrdZ1QQcmdZViewItem