I just received my latest order from NOE in todays mail. Among the items ordered were Al's gas check expanding rams. One thing I've found to be a constant problem is one mans idea of gas check shank size and another mans idea of check size. Up until today I've made my own expanders out of bolt shanks and used my drill press as a means to supply the leverage. (Thanks for this idea Ben) Also, I have a 3" 7/8X14 bolt that I use in my presses to arbor press leverage when needed. This bolt works fine as an opposing face to the NOE expanding rams or an opposing face die can be ordered from NOE. Great little tool Al. Thanks Gp