I'm guessing it's just welding flash as the arms look to me to be friction welded, so I doubt very much grinding or turning the flash off will compromise them structurally. Friction Welding - FPE Thompson Friction Welding - Innovators in Friction Welding
I was just going to do the same thing, got as far as the neighbours lathe to turn it off and that's where my spare arm has sat for three months or so.
(I bought the hollow bar to sleeve them about three years ago)




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