Could the user say what brand an HX4 crimper is, and what brand the connector is? BTW, it's "ferrule." Some connectors have color bands to identify which die to use, especially if the connector and crimper are by the same mfr.
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Here's a link to Amphenol's drawing with installation/assembly. You may have to be logged into GS. It just says 'Crimp outer ferrule using 0.255" hex die'.