See this is what happened. I got a oversized bolt that was suppost to tap it self, but it striped out too. Then we looked in the hole and you could see where the original threads had been striped out and replaced by a helie core(the replacement threads you often find in remanufactered alternators). When I tried the self taping bolt, peices of thread were coming out of the hole(like a big spiral). So I bought another self typing bolt and now it won't even thread in. If I can find a tap I will try to tap it.
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1987 Buick T-type
1998 HD Electra Elide
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