Between Omaha and Des Moines, 7 miles South of I80 | Look at the chart and this website, and it looks like at about 50% crush of Belleville washer you have about its greatest force. (But I'm no engineer) I'd say, if there it a slight difference(in shape of concave) in your JD application, then the Belleville washer should provide some force, when if it gets installed where "almost" matches the shape of the big disc blade. http://springipedia.com/belleville-washers-formulas.asp
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Lock washer for arbor bolt on 512 disk ripper
