McCulloch B43 BT Strimmer: Spark plug change

Hi,

I'm new to the forum and came here looking for help replacing the spark plug on my McCulloch strimmer.

I have zero experience tinkering with engines so could really do with some idiot proof help please.

My strimmer rolled off a stand and landed on the garage floor smashing the spark plug. So I ordered a replacement. The spark plug which was originally in the machine was a Champion RCJ6Y so I looked on Amazon and found one that said it was equivalent to this plug.
I tried putting the...

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