Kando
Silver Member
I would try getting a good grip without removing any material. You can always remove more, it will be exceedingly difficult to replace any that didn't need removing.
Due to previous attempts chewing up the surface I haven't been able to get a solid grip. Too much metal scraped around, and it tends to grip onto that and just scrape it off. Creating my own flat surface should help. The original plugs are solid, the brass replacements I bought from Napa are hollow.
Pics for reference.



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