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There's probably not enough homogenous meat to drill & tap for a helicoil and less likely for a keensert. You could drill an oversized hole and weld in a short section of rod that’s been drilled and tapped for the appropriate fastener or you could grind out the weld and some parent material and weld in an nut.
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Bill
1987 Marine Blue 911 Carrera Coupe RIP 01/2011
1987 Black 930 RUF Coupe Resurrected, 2488 lbs, EFI Technology, UMS Tuned - Mild & Wild, Current in pieces at paint
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