It is one of those floating tremolos with three screws in the cavity and two screws in the front that raise or lower to action. And on this issue why i want to use heavier strings is because i feel u get a ballsier sound from them, and somewhat more sustain. extra lights are a little weak.but then again its like butter and easy to play. but i think i will just stick with the XL’s on the strat and put heavys on another guitar, probably the Schecter elite c1. I think my heavier rock songs will sound best with it anyways. but hey if u know how to solve my prob i d appriciate it.