Drill a 1 1/8" hole for your buttons. 1" isn't big enough because of the outer arm for the switch. Simply drop these through and screw on the plastiic nut that holds the buttons firmly against the control panel. The little red square pictured on the white switch here is the thing which gets clicked when you press the button from above. Obviously this one is upside-down since there's no way for the button to push that red switch.
So, let's see how you put one in correctly... First, with switch towards button, get the hole on the switch-side of the switch enclosure positioned on the post closest to the button
Now rotate the switch on that post until it snaps the second post into place in the second hole.
That's it! Wiring these is pretty straightforward but can take a second to understand. There are 3 terminals on the switches. The two parallel are connected to the switch and the 3rd on top is for common/ground. To determine which of the two switch connectors you want to use, look at the side for a diagram. You should see a line leading to one but not to the other. The one with the line means it's engaged by default. Pressing the switch moves that line to the other terminal. Thus if you want a switch to only be activated when you push it, connect to the post which has no line leading to it. This is the terminal you use when connecting the specific control wire from your PCB (mini-PAC, i-PAC, keyboard, whatever). The top (ground) one gets used when you connect all of the switches' grounds together in one long daisy chain. that way all switches get a route to complete the circuit back to the PCB.
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