Forum:Stingy Claptraps

Arrgh! So, ive just spent the last hour restarting my Xbox, and have been unable to get anothe backpack SDU from the Tetanus Warrens Claptrap on PT2. I'm 0/15 right now, is there any particular trick to getting it to give one up? I'm nearly at the point where I'm just gonna say "screw it!" and have someone dupe me some backpack SDUs HandofBobb