Pro tip: a guy at the Tulsa hangar showed me why my pigtail splices kept failing on the CRJ
I'd been crimping with the wrong die for 2 years and never had a single return, but after switching to the proper Mil spec tool he handed me, my pull test pass rate jumped from 78 to 100 percent on 40 splices, so what's the one tool in your box you wish you'd bought sooner?