That hardware company that advertises in Stereophile had a great HYDRAULIC crimper (I bought one) for like $60 or so. It is a super crimper. it will totally cold weld the parts together. It's only flaw is the dozen sets of dies included are all hexagon shaped. It would be better if some were ground out to an oval, or round shape. The dies are hardened steel.
Anyway, I just used it again after it sat for a year, and it has not leaked (a problem with a lot of hydraulic stuff)
Anyway it is the cats meow of cold weld crimping. It takes almost no effort at all to get an incredible solid cold fusing of the parts. I have very weak hand strength and it does the job, no problem.
Like I said, if you got some of the crimp dies recut by a machinist, it would be the best possible crimper ever.
http://www.harborfreight.com/hydraulic-wire-crimping-tool-66150.html?