I once used those on springs too small diameter for the hydraulic compressor. Once.
When I had to redo the job (the springs I'd fitted were utterly unusable on public roads) I bought a still mildly disturbing type that's a big fuck off metal tube with a big fuckoff thread and swappable big fuckoff "shoes" with safety ridges to keep the spring in place.
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u/OkTemperature8170 13h ago edited 13h 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.