Maine, since when does a plain oval shape die count as a proper crimp for anything?
Chip, is it at all feasible to simply remove the thinner wire from the airgen, and run the 8AWG cable all the way into it? That also eliminates the need to splice completely.
The HF tool may be the only one of its kind on the market and it sure LOOKS good, but if you find the thread discussing it...there's some question of exactly wtf they are selling and apparently even that varies from lot to lot.
Of course, folks have been known to simply use a vise and "swage" the hell out of battery lugs when there's no fancy $200 crimping tool around.