Tore right around the butt joint weld which appears to extend to the edges of the tube. Not a great design IMHO. It should have some sort of flange to distribute the load. New design looks much better.
Though the comment about keeping the lock nut locked are interesting. A loose lock nut could cause all sorts of nasty shock load.
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I am a Commodore PET --- Now get off my lawn you kids...
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