I'm finally putting the snowblower away!
I am happy to report that the UHMW self adhesive tape worked extremely well and exceeded my expectations. I originally guessed I would be lucky if it lasted a season.
The photo below shows how I wound the tape around the inside chute tube. It also shows the PE ring I made to make the chute rotate and slide with less friction.
The tape was originally white and now appears clear. It held on the exit tube and never came off. The UHMW provided enough slip that the chute never jammed up while rotating. If the summer heat doesn't cause the tape to peel off while the snowblower is in storage, I expect to get another season use out of the tape. If I was smart I probably should have wrapped something around to hold the tape in place as "just in case", but, oh well, the snowblower is now sitting in the storage rack 16 feet off the ground. I will see if it's still there in the fall time.
Would I by the product again to do this in the future? Absolutely.