I bought eight Harbor Fraight 60 inch aluminum shaft clamps as in the pix below. Although I like them, they're just too big for my little shop, so I've decided to cut them down to shorter lengths. I'll use a fat wedge to keep the ends from distorting as I cut them, then drill a 1/4 hole in the end an put a bolt through to stop off the end. A little lesson for me, bigger (longer) is not necessarily better. I also have a set of Jet parallel clamps that I really love using. The little lever is a quick release, a really nice feature. Wax the shafts when using for glue ups. No fun scraping glue off.
The more I do, the less I accomplish.