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No Truss Rod

My nephew just bought a bass and I see no where on the bass where he could possibly adjust a truss rod. Which leads me to believe there was never one installed. My question are: 1. How viable is a bass without a trussrod? 2. Could a trussrod be installed now if it doesn't have one? Thanks for your help guys.
 
Affect sound? Not likely.

Will it start to bow? Probably. It's not guaranteed, but it's a safe bet that it will.

Have one installed? It'd be expensive, and pretty invasive. I can see 3 ways to do it:

1) The neck is routed from the back in a fixture to ensure consistent depth and straightness. A truss rod is installed, and a fillet is glued in place (like the Fender skunk stripe). The neck is then refinished, and a body modification may be necessary to add truss rod access.

2) The fretboard is removed and the neck is routed from the top, again in a fixture to ensure consistency and straightness. Truss rod access can be made at the head or the heel. If at the heel, the body may need to be modified to add truss rod access. The fretboard is then replaced, and it is quite likely that an entirely new board would have to be used. The neck will then have to be refinished.

3) An entirely new neck could be made.

So it's a labor intensive task regardless of which way you go. I would recommend #3, but I'd just replace the whole bass before I did that. A new neck by a custom builder can easily be more than $1000, and you can get some damn fine whole basses for less than that.
 
If the bass was designed not to have a truss rod it could be fine for years. There are lots of old Gibson guitars and mandolins out there that have survived a the better part of a century without truss rods. I played this bass for a decade with no issues whatsoever. No truss rod.
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Truth is I've seen way more instruments without truss rods that were just fine than cheap POS that they just "forgot" to put one in. Name me one brand or model that you know of that doesn't have a truss rod....the original Danos are the only one I can think of off the top of my head. ???
 
You don't see many old survivors without truss rods, because most of them don't survive.

I had a late 70s or early 80s Hondo. It was a crap bass. No truss rod, and a bow in the neck to make give an archer ideas.

Or do you mean "major" brand basses without truss rods? There aren't many, because basses need them. I'm really happy for you that you have a bass or two without a truss rod that are fine. But that is not the majority experience.
 
You don't see many old survivors without truss rods, because most of them don't survive.

I had a late 70s or early 80s Hondo. It was a crap bass. No truss rod, and a bow in the neck to make give an archer ideas.

Or do you mean "major" brand basses without truss rods? There aren't many, because basses need them. I'm really happy for you that you have a bass or two without a truss rod that are fine. But that is not the majority experience.

It could easily go either way here but I certainly wouldn't write the thing off as quick as you did especially considering the OP specifically stated it was hand built. It would probably be wise to reserve judgement until we see some pics.