Article by biknut of the XLFORUM ¹⁾

This is the inside of a VOES (or Vacuum Operated Electric Switch).
This one has been cut open to reveal the components.

^{2) 3) 4)}

Here's a look at the adjustment screw.
^{5) 6) 7)}

Breaking the top off.
^{8) 9) 10)}

^{11) 12) 13)}

Finally we get a look at the diaphragm.
^{14) 15) 16)}

The orange button in the center operates the switch.
^{17) 18) 19)}

In order to remove the micro switch, we need to dig this crap out of the other side.
^{20) 21)}

The micro switch is part number (1647RJ) also has S S-5-2 T
Switch rating is 5A@125V or 3A@250V AC
^{22) 23)}