Manufacturer Seimitsu is well known for the PS series pushbutton, whose microswitch differentiates itself by requiring just a bit more force to actuate. The MM9-4 spring adds an extra .16 LBF (pounds force) to Seimitsu's 30mm pushbutton series. This is desirable to some who appreciate using more deliberate input force and a bit less sensitivity than Sanwa's SW-68 offers.
Adds .50N for Total of 1.50N (0.34 LBF)
By default, Seimitsu microswitch requires 1.0N or 0.2 LBF (pounds force) to each button. The MM9-4 adds .50N, for a total of 0.34 LBF. The result is a much firmer button input requirement that quickly accelerates the button cap's return to neutral.
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