All of the above. Don't waste time on Harbor Fright. They have better quality rods at the welding supply and they're all cheap compared to mandrels. You can harden them a little more by heating them to cherry red (not really glowing) an dunking them in water a couple of times in quick succession. I've even gotten the shop guys to cut mine to length and de-bur the ends for me a time or two, if I ask really nice and take them cookies.
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