I've turned literally thousands of these by hand and What I so is place a small allen wrench in a vise very very tight. and I will leave about 3 to 4 inches of extra wire and spin it once around the allen wrench and 3 spins turning (every half turn) and finally cutting the extra off and pinching it in with plyers.
It's important to use very good gripping plyers I prefer small Lineman plyers. And if your scared of scratching the plug, put masking tape on it first.
Good luck
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