Holier than thou
Putting the switch fully together, we can check the fit and operation. The tightened button holds nicely in the box.
Now, to take it all apart again. More holes to drill.
We need to drill holes in each end of the box for the power cord. The holes will be measured off the collet size. One hole in each opposite end. Simple!
The type of Collets I used, tighten by screwing in.
As you can see, I have also knotted the cable, as well as use a collet restraint. Over time, the collets may loosen and lose grip, so the knot is an extra safety measure. Crude, but effective.
Next: Striping is good