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Excuse me, but what the hell is this?

And what the heck are these silver speed-bump looking things on the long, straight part of my guitar?
IMG_2046.jpg

Those are mineral deposits built up from years of sublimation of the metal in the strings. Get a pair of pliers and remove them right away!:eek:
 
To summarize -




I've been wondering ever since I started playing.


Strings pop off the nut without it. That's all





What's it called?

It's called a "string tree."



and the reason why some basses dont have them like the epiphone thunderbird is that the headstock is angled back enough that the headstock angle presses the strings into the nut...




If the strings don't cross the nut at the correct angle they might buzz, and will definitely lose a lot of sustain.

Too much of an angle is bad, too.
The string gets bent and tone/intonation goes in the toilet.

I have been known to add washers under the string tree, or grind away the bottom, just to get it right.

The name "string tree" comes from the way they are made for Fender Stratocasters and Telecasters, etc.
It's a smaller design that has to be seen to be understood.



;)