The problem appears when the jaws close, the resulting space is more of an oval than the circle of the DuPont crimping tool: PR-3254 “DuPont” die compared to DuPont HT-208 (AWG 24) die.

It's worth mentioning that this DeWalt PEX Crimper Tool is an attachment designed for use with "select DeWalt 20V Max and other pro-grade 18V impact drivers," including Bosch, Craftsman, Kobalt ...

Emerson introduced the Greenlee GRE-6, a hydraulic tool with six interchangeable head options to cut wire, crimp connectors, and punch electrical boxes.

It's worth mentioning that this DeWalt PEX Crimper Tool is an attachment designed for use with "select DeWalt 20V Max and other pro-grade 18V impact drivers," including Bosch, Craftsman, Kobalt ...