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Comments
I hold down the string at each end of the neck and adjust the truss rod until it's almost flat - so the string has just a tiny bit of movement in the middle, then look at the action and if the bridge won't go low enough to get the action where you want I'll add a shim at the body end of the beck socket to increase the neck angle.
Don’t bother with those fancy wedge ones, a simple card or wood veneer piece across the end of the pocket is easier and better. I prefer to make it big enough that the two end screws go through it, which prevents any possibility of the (I think largely mythical anyway) risk of a ‘turn up’ at the very end of the neck.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
- The truss-rod adjusts how bent the neck is and only operates from the nut to the end of of the neck. To check the truss-rod, you should press on the first and top fret and be just able to put a business card in the gap between the string and the 12th fret. As such, it's either right or wrong and not really the way to adjust the action.
- The action concerns the full length of the string from nut to bridge. To adjust the height or action you raise or lower the bridge saddles; if
they are maxed out then you can put in a shim to adjust the tilt of the neck, which effectively provides a step change to increment
the bridge adjustment range.
There is a further adjustment available which is the nut height; if you find that pressing on the first fret is harder and has more travel than others, even to the point of the notes sounding out of tune, then the nut may need filing down to the appropriate height.That's confirmed the understanding that I thought I had - the problem was that I had done some reading on bass setups and very quickly people start talking about shims being "required" for Fenders etc etc - it's hard to differentiate the bullshit from reality sometimes.
:-)