SMK spring over membrane

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SMK spring over membrane is buckling rubber sleeve spring over membrane switch, currently known only from a single keyboard.

A helical spring provides the membrane actuation pressure, while key return is provided by internal buckling rubber sleeves that the sliders appear to fit onto within the slider guide shafts.

• 
  Keycap, Slider, Guide shaft and buckling rubber sleeves

Keyboards

• Some Apple Keyboard II<ref name="applerescue">Apple Rescue of Denver - Apple Keyboard II Parts ("Version B" is the version with this switch)</ref>