Mike, like the others said about the socket, 7/8 will do it. But, if the center electrode has square edges the old plugs are most likely fine to use. As long as the plugs aren"t wet from oil soaking or flooding they are ok to use in the tractor engines. Save the money. I have had my f-12 since 1999 and it has the same plugs in it when I bought it and they were old then, it runs like a champ! Spend the money on carb cleaner and a wire brush to clean the plugs. You will need the wire brush down the road, trust me!
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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