I realize this is an old thread, but I just wanted to give it a bump to say it helped me quite a bit.
I rebuilt a 717 several years ago, and over those years I've had to pull the pot out, squirt Deoxit in where the wires are, and reassemble. Each time it would usually fix the problem, but sometimes I had to repeat it a couple of times. In each case, the cure only lasted for a while before I had to go though the process yet again.
I found this thread because I was Googling for a pot replacement, and saw the "drill" fix. I tried it yesterday, and it worked very, very well. I don't know if this fix will be more permanent, but as I drilled the hole in the top of the sections, now all I need do is pull the top cover and drip more Deoxit in the holes. No more partial disassembly hassle for a iffy fix.
To the OP, THANKS.
I can't believe I didn't think of this on my own.