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Thunderbird Club

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Not to distrust, but I've some 4mm hex and they all fit loose. I've found a 4.5mm and althought it fits (more or less) it slips. The inner side of the nut (??) seems to be totally rounded instead of hexagonal

Well, a 4mm allen/hex key/wrench came with my VPro. And I've used, (what I normally use for 4mm on my basses), a 4mm T-Bar to adjust. You saying that the hole looks round..... Makes me wonder if someone has rounded it out by using the wrong size wrench..... Sorry, can't be of more help.
 
Well, a 4mm allen/hex key/wrench came with my VPro. And I've used, (what I normally use for 4mm on my basses), a 4mm T-Bar to adjust. You saying that the hole looks round..... Makes me wonder if someone has rounded it out by using the wrong size wrench..... Sorry, can't be of more help.

Your help really really appreciated. I bet you're right that previous owner used a wrong size wrench. Thanks so much!!!
 
OMG! It's f**ing strange. It doesn't seems to be a allen wrench. The female looks like totally round not hex. Any one knows what to use?
It's boogered...I think that's the technical term

Google this:
stripped allen head truss rod
and take your pick on how to proceed
 
Just measured the factory supplied hex key that came with my VPro. Just shy of 4mm. It's definitely supposed to be a 4mm key.
TB_VP_HEX.jpg