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Originally Posted by phatairman
So the medium spring (851) is exactly 20 MM taller than the heavy spring (850). Thus is the need for the spacers?
Brain starting to work.....
Fame suit on. 
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no, that's backwards.
Heavy springs are 851
Medium springs are 850.
To "convert" med. to hvy add 1" spacers or 2 10mm trim packers.