Turntable Power Cord Upgrade

The sound of a component starts with the power supply - not what comes before it! Physics 101! 

False. 
Only if the power supply is perfect. 
No power supply is perfect.
Whatever noise or fluctuations are on the incoming AC, some of that will always make it through the imperfect power supply. 
Because: no power supply is perfect.
Therefore, the quality of the incoming AC does matter.

Logic 101.

I should have pointed out that the Kuzma motor is dc, that being the case I would assume that any difference would be minor. I am using a Cardas Beyond Clear right now and will try others I have on hand to listen for changes. Just wanted to pick some brains, thanks.

The same applies AC or DC. The main exception being if the DC involves a battery, and if the AC charging the battery is disconnected during play. Because essentially, as I just showed, as long as there is any connection to AC then some of the noise on the AC line is going to get to the DC. The one exception is when a battery is used, and even then only when the battery charger is disconnected from the line during play.  

This isn't guesswork or rumor. This is actual experience running all these different ways.

Why not put the power cord (minus the ends) inside the chassis between the power supply capacitors and the circuit boards? That should improve the "imperfect" power supply according to millercarbon's logic!