Went ahead and helicoiled it for the original size threads, with what was left of the old bolt still stuck in there! I did some measurements, and it's not possible that the old bolt is protruding past the case, but to be safe I dropped a big dollop of JB Weld behind the helicoil to permanently fix the old bolt in place and anchor the helicoil (due to there not being any fixed stop behind it).
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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