I purchased B&C Specialty's crimping tool in order to fabricate some of the fat wires on the engine side of the firewall. One of those wires is the alternator B-lead. I went with 4 AWG wire to handle the 60 amp alternator output and crimped 1/4" ring terminals on each end. All you do is whack the crimping tool a couple of times with a hammer and viola, a perfect crimp on a large wire. Add some heat shrink and you're good to go. The B-lead is ready to install.
B&C Specialty crimping tool at work
1/4" Ring terminal crimped and heat shrinked to 4 AWG