I'm having a problem with a tremolo arm I just bought. This is my first Floyd Rose and it didn't come with the arm. I ordered an arm from a local music store and it won't fit. I'm guessing it should just go in the hole and screw in. it seems the bar is a little too big. When I ordered the bar I told them it was for an ESP KH-202, which it is. I think that they come with the Floyd Rose stock. Anyway, I don't know if I have the right bar or not. Do specific bars go to specific tremolos?

Any help would be appreciated.