[Elecraft] K1 tuning nonlinearity mod?

[Cathy James]

I recall seeing a reference somewhere to a mod for the K1 tuning pot 
circuit.  The mod causes the pot to change frequency about 13 kHz per 
turn at the low end of the band (thus giving easy tuning in the portion 
where most ops will spend most of their time, and 22 kHz per turn at the 
high end of the 170 kHz tuning range (thus giving access to all of the 
40 meter CW band, at the price of touchy tuning in the seldom-used portion).

Unfortunately I can't seem to find the references now.  Can anyone point 
me to information on this mod?  Does it work as advertised?  I am not 
familiar with the exact relationship between the voltage across the 
varactor diode and the resulting capacitance, so I can't compute it 
directly.  I *have* found some pointers on how to linearize the tuning 
action at about 17 kHz per turn, but that is less ideal than the 13/22 
arrangement.

Thanks for any replies.

Cathy
N5WVR