Hot bucked rivets are tough little buggers. Had good results using a thin kerf cutting disk plus a chisel. Start at the center of the head and cut straight down while working out side to side just enough to get down to the shank at the level of the sheetmetal. Then one good whack with a sharp, hardened chisel will usually pop the rest of the head off without wrecking the sheetmetal around it. Time consuming but it worked for me on my old BB.
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