Made my first set tonight. For anyone who's interested, if you can't or don't want to buy the parts on Amazon here are your probable local sources:
Screws - Radio Shack
Tubing - Auto parts store, ask for "gauge tubing"
Weed whacker line - any hardware store
I am having difficulty getting the cable to stay inside the tubing, the super glue isn't holding. Maybe I need to try a different kind. Other than that - piece of cake! Thanks for the great tute!