[pianotech] hex size

[algiers_piano at bellsouth.net]

I find it's also the size of the handle end of my regulating screwdriver. 

---Dave Doremus 
  New Orleans

On Aug 18, 2011, at 4:37 PM, "David Stocker" <firtreepiano at hotmail.com> wrote:

> I find it is usually the size of a vise-grip around the outside of the screw head.
>  
> David Stocker, RPT
> Tumwater, WA
> 
>  
> 
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