The original SH101 power switch has 8 pins, which seems somewhat

pointless as four of them arn't even used! 

This switch has 6 pins, but is a drop in replacement. 

Simply remove the old switch and then solder this

 switch in using the upper six empty solder pads closest to 

the power LED above the switch, as shown in the images. 

Make absolutely sure you have the new switch positioned 

the same way round as the old one was i.e.

 so the green actuator stem lines up with the power LED.

As you can see from the images, sometimes 

the middle two pins on the switch 

don't even have usable solder pads as its only 

the outer two pairs of pins that actually do any switching. 

Solder them in if the pads are there, 

but otherwise its fine to leave it as shown.