I was fitting some geared chinese type Kluson tuners to my cheap guitar project..I did it by eye and the result was not very good they just didn't look right..It's the first time I've done this on a new guitar neck...So I made up a simple device to hold the tuners in line while I re-drilled the pilot holes .. it's just a piece of folded aluminium...the pics will show how it works. BEFORE THE JIG FITTED TO THE TUNERS THATS BETTER