I had to pass this one along to the forum.
I came across this item on theBay and almost dropped over.
$247.16, so far, for a 5-megohm potentiometer.
The shaft will need to be extended to fit a CT-100.
Here's the link to:
RCA CT-100 FOCUS CONTROL??
http://cgi.ebay.com/ws/eBayISAPI.dll...m=130357843431