The installatiion of a "real" power switch is recommended.  I utilized a push-on, push-off switch which was in my parts bin.  A liberal amount of hot-melt glue will secure the device and allow some minor physical adjustment to ensure the button/slide does not rub the hole that was made in the plastic case.

I elected to remove this and utilize the space for a real power-on LED - strictly optional.  The pix is out of focus, but the LED placement does require the use of a drill and the addition of a current limiting resistor.