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Yamaha Broad Bass Truss rod tool?

I posted this before but didn't have all of the info. I'm looking for the tool to work on this. It looks like a strange socket wrench. Any ideas?
Thanks.
Arnold
 

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Arnold,

Can you tell us what model of Yamaha bass that is? I'm used to their basses having a standard hex nut at the end of the truss rod.

Could the nut be missing here?

Anymore detail about the bass would be appreciated.

Bob
 
HI - I think I can help!
from:
Acoustic, Electric, and Bass guitar trust rod allen wrench/socket sizes - Acoustic Guitars - Guitars & Basses - Musical Instruments
Last Update: 06/07/2011
Newer Guitars and Basses:

The size of the Allen wrench for the trust rod is 5mm.

Older Guitars and Basses:

The size of the Allen socket wrench for the trust rod is 8mm but there may be some variation on some models.

What you need, I think, is called a right angle truss rod wrench in one of those two sizes.
Like this
8mm Truss Wrench | Allparts.com
If you have a socket wrench set - you might be able to tell which one it is by just sliding the socket over the nut, if yours fits, while not being attached to the wrench handle.

Music shops won't carry this.

Sears has an angled socket in several sizes that allow the socket to be at an angle to the handle, but these $5 Allparts tools are probably the smarter option.