Right now I'm working on a guitar build/rebuild, and the guitar was right handed with a trem bridge originally. I was wondering if a lefty trem bridge would work in the same cavity, or if I would need to modify it a bit. Also, if I wanted to make it a non-trem bridge, would I just have to fill the cavity and re-drill for it? Thanks in advance,

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What kind of trem is it? A floating bridge? If it's floating you can just switch all of the saddles around and bam... some even have the bar hole on both sides.

however, if your trem is symmetrical I see no reason why it wouldn't fit, unless it has a special rout... Try flipping it and seeing yourself? If you wanted to use like a gib bridge, filling the cav would probably be a good idea, but it is not super neccesary.
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