Almost from the starting of electrical powered Language instruments, guitar players have desired technical gadgets to allow them to detune the post. Thus the appearance of the vibrato or benefit bar in contemporary parlance. And yes, the misnomered tremolo. Once more for the record: vibrato is message difference, which a benefit does (detune the post by helping to loosen them). Tremolo is amount difference, which you can accomplish by messing with your amount manage or, if you are fortunate, operating the spring-loaded Orgeltone “spigot” on your Framus.
Without belaboring this topic here, generally three styles taken over whammydom for the first 30 years: the Bigsby – top-mounted, a easy bar with the post covered around seated on a big springtime under a handle; the Fender Stratocaster vibrato, an flexible link set up with a big slice of steel climbing down into a hole connected to some lengthy stress rises at the end; and the Jazzmaster, type of an inversion of a Bigsby with the springtime within a not so deep hole.
All perform fairly well if you are material to restrict the impact to little thrives or even a little more committed wanking. But if you want to get more competitive with one of these conventional whammies, you would better like enjoying out of track because once you returning off the springtime, the post are likely to be expanded and/or the product will not be in accurately the same position where you began.