Bicycle Mirror

This mirror has evolved over a number of years and is now worthy of posting. The bar end piece fits a 19mm (3/4") internal diameter handlebar. Other parts needed are: a 50mm diameter mirror, an M5 set screw with nut for the bar end piece, four short M3 set screws for the cap, a longer M3 set screw for the arm, a spring of some sort (e.g. a cut down piece of spring from a hand soap dispenser, a small piece of flexible plastic tube or several small O-rings), a small rubber band or piece of