If you damaged a Champion RJ19HX spark plug, then you can indeed replace and substitute that with a Champion RJ19LM spark plug due to the similarity in their sizes.
Rj19lm
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rj19lm champion
Champion spark plug RJ19LM is for lawn mowers or similar equipment. The standard gap is .030 inches or 0.76mm.
Throw any RJ2YXLE away that you come across and install a RJ19LM. Problem solved. I work for a company that sells briggs products and we have replaced, literally, hundreds of these this season. It's a horrible design. There are a few other plugs that will work as well, ( RJ19HX for example ) are more money, but you can rely on a good old RJ19LM to get the job done. Hope this helps.
Champion RJ19LM will work.
about an 1.8 inch is close enough
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RJ19LM Champion
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Champion RJ19LM
Champion RJ19LM