This may come back to bite me on the arse, but I've had no problems with my crimper (- that sounds weird...) Just spent a couple of minutes trying to pull a ferrule off and it's on solid as - not budging...

I have a little '+ & -' adjustment wheel on the crimper that appears to set the level of squeeze - if I'm doing thin wires I'll ramp it up (+) and dial it back for the fatter gauges. Pff, I dunno - like I say, it appears to work a treat, but I'm a noob with very little experience..!

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Wal.