Drifting Unisons

[Newton Hunt]

> There is a consistent difference between left and right 
> strings, sometimes as much as 20 cents in mid to upper treble 

The pinblock shrinks or expands, gradually, with changes in humidity. 
It can only expand a small amount from left string tuning pin to the
plate flange, a little more from center string pin to plate flange and
more from right string pin to plate flange.

Simple answer but it took me years to understand it as well.

		Newton