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Collection, Preservation and Display of Old Lawn Mowers

suffolk crankshaft nut

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.