[RodB]

Switching the hot Line is preferred since this excludes any line voltage beyond the on/off switch. Better to have the X1 safety capacitor after the switch. Then no components have any power applied until the switch is turned on. I've noticed many, but far fewer than there should be, manufacturers did this even though polarized plugs didn't get much attention in the late 40s.

I've used a tie wrap on the inside of the chassis for strain relief.