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  1. Nosmada

    blade bolt metric or standard U.S.?

    I have a 21" 140cc 550ex mower. Nowhere can I find the size of the hex bolt (3/8"-24) head. 5/8" fits - fairly well, but I suspect it is metric. Does anyone know. Does Troy-Bilt generally use metric or U.S. Thanks. My one observation about the blade on this. mower is that you must be very very...
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