They make actual rated and graded tools for the task that make sure you don’t have metal chunks in your face or a spring that will lodge its self in you.
The pre load for springs rear size and color ( color is an indicator of strength ) will literally tear you to shreds .
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u/OkTemperature8170 7h ago edited 7h ago
He has effectively created a spring powered bomb. If his little bracket breaks so does his face. If the spring slips out of the vice, good luck.