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Hi guys!


I've got a Fender mustang competition from 1972.?

When I bought the guitar there was no tremolo arm.

I bought a new one online, which fits on a '65, but it doesn't fit.... (https://www.thomann.de/nl/fender_mustang_tremarm.htm)

I measured the parts: the tremolo arm is close to Ø5mm (around Ø4,95mm), the bridge hole is around Ø4,7mm.

Is the hole size correct, or should it be Ø5mm? Or do I need a thinner arm?


Hope someone can help me.




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  • 5 weeks later...

Hi. Whether the hole size is correct or not is immaterial - it is the size that you have! The vintage Mustangs typically have a smaller hole in the bridge and the newer replacement whammys don't fit. I don't recommend drilling out a vintage part even though that is the simplest solution. Something is only vintage until you alter it. I suspect the arm is for a '65 Reissue or  a MIJ Mustang, not an actual '65 Vintage replacement part. Regardless, neither may fit into your bridge. I would do some more searching for something vintage OR simply file/sand down your new arm to JUST fit in the smaller hole. If something goes terribly wrong (I don't know what that could be), you are only out a few bucks. Shouldn't take more than 10-15 minutes. You may want to wrap some electrical tape around the bar near the 90 degree bend so that you don't gouge or scratch the chrome when you are filing.

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