Decent price on spark plugs

Feeler gage is easily acquired at a parts store.

Adjusting the standard spark plug side electrode is about like adjusting your rear view mirror - gentle prying with a flat screw driver to widen, or gentle tapping with a wrench to narrow.

YouTube is your friend.
 
the spark plug tool is for an 18mm.
whether an 18mm socket would work is the big question
like Joe says always set/check the gap
 
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