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Compare springs with the same spring rate and the same length and working length, but big difference in lifespan Spring 1 in 3 mm and spring 2 in 1 mm have the same force.Feather 1
Suppose we don't have much space but the spring must have the same length and working length and the same spring rate as above, the outer diameter only 9.6 mm.Veer2:
Council: the more wire length in the spring the better.
The condition of a German loop is that the hook length of the loop is 0.8 to 1.1 the inner diameter.