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Collection, Preservation and Display of Old Lawn Mowers

suffolk crankshaft nut

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Re  suffolk engine 75g14 24a  could someone inform me of the nut size  etc 

left handed aerotight locknut  which secures flywheel too crankshaft. THANKS

greensleaves Wed, 14/08/2013

thanks for info  but i  said nut size instead of thread & size  are they imperial size or 

metric . sorry for that.

wristpin Wed, 14/08/2013

Don't think metric had been invented when they made those! - Imperial.