While I am sure there a probably several firms selling good replacements, we always used the LN magnetic plugs; they worked well, and we never had any issues with them. That said, others have encountered problems with them, which seemed to be related to over tightening them. But from my experience, if used according to how LN tells you to, they do just fine.
If you want to stay with a non magnetic plug, the factory part is fine as well.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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