I've been fixing the same Hotstick for 8 years. I slit the outer tube lengthwise next to the eccentric inside for 3 inches with a hacksaw. Then put a shaped 1 inch long by 1/4 inch wide piece of epoxyfiberglassed cloth inside on the low worn spot with epoxy. (The inner tube has already been covered with non-stick Xerox overhead film). Compress with a hose clamp until it works properly, then wrap with thin nylon cord, and epoxy the whole outside carefully. Remove hose clamp and film- done.
Lasts 2 years.