| First of all, there should be SIX screws holding it in, one under each string.
While it LOOKS like those screws might hold the tremolo onto the body solidly, the front of the plate under the screws is beveled, allowing the bridge to rock back and forth on a knife-edge that is machined into the holes of the tremolo base plate. Under the tremolo is a sustain block, which does two things:
1) adds weight to the assembly to increase sustain and overcome the interaction of string vibrations (sometimes called "warble")
2) provide an extension of the plate that the return springs can hold onto.
Any tremolo is just a counterbalanced system where spring tension balances STRING tension. How accurately it works and stays in tune depends on lots of factors, many not having to do with the tremolo mechanism itself. |