This ring press works great and it doesn't involve any welding.  You can buy the metal cut to length at a "metal-by-the-foot" outlet.  I would like to thank Jeff Crews for the idea of using an anti-twist plate to reduce the screw's twisting action on the glue-up.   Jeff also found the nice Jorgenson screw presses for sale on the Internet.  Otherwise, these are pretty standard presses and are made primarily from 3" steel channel and 1" threaded rod (3/4" threaded rod works well, too).  

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