Can anyone help identify the correct tool to adjust the truss rod on a Roscoe SKB 5. I've gone through all the common tools for set-up on other basses but have nothing that fits the Roscoe. Any help, tips, or clues would be greatly appreciated.
 
Sidenote and IIRC: the TR access is rather shallow. I had to lop-off additional mm's from the hex key's short arm for unrestricted introduction.

Riis
How did you cut the Allen key? If you used a hacksaw, throw the key away and buy a good one, as the steel is too soft. You don't want the key to start stripping as it'll damage the nut too. With hard steel, you can score it with a Dremel cut off disc, and snap it in a vise at the score line.

Edit: Sorry, this advice is directed to the original poster.
 
How did you cut the Allen key? If you used a hacksaw, throw the key away and buy a good one, as the steel is too soft. You don't want the key to start stripping as it'll damage the nut too. With hard steel, you can score it with a Dremel cut off disc, and snap it in a vise at the score line.

Edit: Sorry, this advice is directed to the original poster.

I have the diamond-edged Dremel cut-off wheels which makes short work of virtually anything.

Riis
 
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The fiber reinforced wheels work. A bit slower.

Even the little abrasive wheels will work, too. Might take two of them.

If it's a good, hard Allen key wrench it will defeat a hacksaw blade in a few strokes.
 
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Unfortunately, abrasive cutoff wheels will heat the steel and remove the temper which makes it softer, exactly where you want it to be hard. That's why I suggested scoring it and snapping it on the score line.

Which is why you keep water handy to cool the work. Spray bottle works just great.

If you have a stationary grinder, especially one with a well, it's pretty easy to keep the temper.

Lots of ways to get it done safely.