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I am more worried about the new improved spring that I have had on hand for about 10 years. As everything is farmed out to you know where and their heat treat process on springs is marginal at best. As an example I have a 12 year old JD lawn mower where the belt tensioner spring for the belt to the hydostatic broke after 1400 hours of use. Good service, i would say. The new JD spring of the same part number and of questionable origin broke after 4 hours. Progress, I guess.