dgriff, the T shaped clamp is a great idea. Coincidentally I took a run through the local Harbor Freight store today and saw this:
http://www.harborfreight.com/3-inch-hand-seamer-66654.html
which immediately set my mind thinking of how I could adapt that or the jaws from it to my WEPS. I didn’t buy it though.
I’m kind of a tool junkie and even though I’m more inclined towards higher quality stuff, I do pick up the odd gizmo from there at times. They had a small arbor press on sale which piqued my interest, but I let it go. Don’t have a need, really, but setting rivets in slab type knife handles comes to mind.