you just found that out? : The FREELOK is a new product that allows owners of double locking tremolo systems to temporarily lock the tremolo block into a fixed position.When it is locked you can drop from E to D w/out re-tuning the whole guitar,bending a string doesn’t drop the other strings flat(unison bends) if you break a string,the ones you have left won’t go sharp to the key of Z,ect…. When its unlocked you can use your tremolo. as usual.Can be installed as a "divebomb" converter,and can also be installed to permanently fix the bridge.installation is simple, and hidden in the spring cavity so it won’t hurt the appearance of your vintage gear.Check it out at http://www.freelok.com