[Bazzer]

joined the chopped magsafe cable to the cheapo 12v psu, set the voltage switch and plugged it in

That's really all the Mikegyver one is; he essentially solders on a female connector to the magsafe cable that matches with one of the standard male plugs that comes with the Kensington brick, nothing more.

That, btw, is the weak point in the Mikegyver one - I've had two fail at the female plug he put on. Next time I'll do it myself.

Scot

I used some heat shrink tubing to support the cable where it comes out of the plug, that ensures that there is not any stress on the solder connections.

Barry