<VV> PG leak

[Padgett]

For various reasons my PG 66 is liable to sit for several weeks at a time. 
After the first few days it slowly leaks PG fluid until about 20 oz has 
collected on the drip pan and then stops. I am told this is probably from 
the shift cable.

Now Bob in "The Classic Corvair" (pg 202) describes various fixes that 
sound good except for one thing:- just where is the leak typically ? The 
O-ring or the cable itself ? If the cable, where on the cable is it leaking ?

And yes, I have the 21 9/16" dipstick.

Padgett