If you unscrew that, the tuning head will drop off. Unscrew the screw on the tuning head right? Anyway I have other question. I have an Epihpone Les Paul Standard but I want to change the tuning heads to the ones on Gibson guitar. But My Epi only 1 hole each for each of the tuning heads, but the ones on Gibson needs two holes, so I must drill one more hole each for each tuning heads?