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IF you screw the old plug back in with your fingers do you get it to go all the way home? If no, chase the threads with a axle grease covered tap made for the job, Take a clean rag and catch shavings or cuttings as you take the tap out. You do not want to have any fall in.
Take a really strong vacuum cleaner and (wait for it), duct tape that sucker to a section of hose that just fits down in the hole.
Suck that sucker out like there is no tomorrow.
Apply a liberal coat of nickel coat to the threads and gently run in the new plug.
You should be good to go.
Good Luck and double check that gap before you screw them in all the way.
Regards,
Paul
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