I just installed it on one of my strats with an original floyd rose. When I push it in to "E" position, it comes up flat. The tiny little set screw is supposed to take care of that, so I turn the set screw until it's correct. It's all good until I want to go back to "D". The set screw locked the unit in the "E" position, and needs to be backed off to let the mechanism slide to the "D" position. Now I'm going to be out of tune agaiun if I want to return to pitch. If I have to bring an allen wrench to gigs, it's going to be a 3mm to unlock the nut. {censored} this $38.00 piece of {censored}.