Yep! Problem is now I can never remember whether the ridged side
of the zip cord goes to the wide plug or vice versa...

Remember you "identify" the neutral. That is the silver screw, the wide blade
on the plug and the ridged conductor on the zip cord.
The wire will almost always be white except when it is 277v derived from 480v
(used in big building lights) That is grey.
Since we are global these days you may also see line cords from Europe that
have blue and brown. Blue is neutral over there.