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The Equivalent K for 2 springs connected in Parallel (like a fork) is:
Keq=K1+k2
So if you have a .3 K spring in each leg - you have a .6k total.
If you bought 10% stiffer springs - you still have a 10% stiffer total - not 20%
(.33k+.33k)=.66k
Likewise, use only one and you have a 5% stiffer total.
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