Does it work...?
I'm not sure if any other forum members are using @Buffers brewery modification, but I had two done by him during the summer and am so pleased with them that I've just gone and bought a third King Keg and got him do the lid for that one too. I'm not a King Keg zealot as I have 3 cornies as well, but until this year my two old KKs were abandoned at the back of the shed, whereas I have now got to the stage where I only bottle a few from each brew for friends and family and all the rest go into kegs both Cornelius and King.
Here is my first pint pulled through my beer engine using Keiths modified KK, it tastes great(Yorkshire Bitter) a small leak on the demand valve(new one on order) but Keiths Mods work great
The 3 I have performed leak free for getting on for a year now so I can answer your question @Clint with a "Yes".Keith deserves a Knighthood in my eyes. Mine works fantastically as well