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 .08 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 .25N for Total of 1.25N (0.28 LBF)
By default, Seimitsu microswitch requires 1.0N or 0.2 LBF (pounds force) to each button. The MM9-4 adds .25N, for a total of 0.28 LBF. The result is a light, but firm button input requirement that accelerates the button cap's return to neutral.
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Seimitsu
Seimitsu PS Button Spring MM9-4 - 0.25N (PS-14-Gx/KN)
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Boing boing boing
If you ever found your Sanwa buttons overly sensitive, ordering these springs and cutting it in half and stuffing them in the button works great (1 spring, 2 buttons) If you count the spring, there's 9 coils so you can cut them perfectly in half. Using the whole spring makes the button too stiff. Of course this is just a personal opinion and preference :) Cheap enough to experiment on even if you end up not liking it. shellspeed on Oct 21st 2021