I was always under the impression that the the term "die" and "mandrel" were interchangeable when it came to tubing benders, but after seeing Power Surges reply and a little research, I can see now that they are two separate components.
Now for the OT part...
Power Surge, is it true that if the tubing to be bent were filled with sand and then welded closed prior to bending that the ID would be maintained even when drawn over the die? I've always heard that, but never tried it myself.
BaconZombie, I like what you've done there. Any rough costs as compared to FSWerks?
Sonic's Mk3 Crew #11