Univox truss rod

It may be superfluous to ask, but what's the problem with the current truss rod. Broken? Stripped end?

 

If its stripped you mean the nut or the threads?

 

Yes, a standard generic Fender-style 3/16" rod single-acting single-rod style truss rod kit will basically fit inside that neck. But it's not just going to bolt in. It may take some fitting or shimming of the slot, and reworking of the anchor area. If I remember right, most of those old Matsomoku necks used a metric 5mm rod, which is slightly larger diameter than the US 3/16" rod. The length of the rod, position of the anchor, and style of anchor could be anything. You'll have to chisel out the filler strip, and you may have to fill and recut the anchor area.

So yes, that's the type of truss rod that I would use to replace the original, but it will require some work.

 

Yes, please elaborate as to what's stripped.

 

Take a picture of that bad boy. You can replace that nut if you can get it off. Manually remove some tension off the truss rod by hand then use a torx bit or ez out or larger size allen wrench to remove it and just replace the nut.

 

If the nut is an Allen I’ve sometimes had luck getting a Torx bit to bite enough to get a grip and unscrew it. You may have to tap in the largest size that almost fits but do it carefully.

Husky 1/4 and 3/8 in. Drive Torx Bit Socket Set (11-Piece)-HTXBS11PCSR - The Home Depot