Being the sort of person that sits and thinks about this sort of crap, I'd say yes, although so small it's negligible.  The strings are constantly trying to pull the head and bridge together. If a bass is stood on something, stand, floor whatever, then the bottom is supported and gravity will help the head move towards the bridge under string tension. If the bass is hung then the head is supported and gravity (the weight of the body) will help resist the pull of the strings.  Very basi
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