In particular its head will accommodate the LED pins, while the tie will be fixed using strong duct tape on the spokes of my bicycle wheels for night visibility and safety.
Weight and dimensions of the system should be the smallest as possible to be almost unnoticed during the day, while providing the most effective visibility in the dark.
Step 1: Material used and preparation
I also used a very thin wire for wrapping (with diameter 0.25 mm for the conductor and 0.56 mm outside) and some heat shrinking tube.
With a small flat screwdriver, used as a chisel remove the inner tab of the tie wrap.
Mark the two holes for the pins 2.5 mm from each other in the middle of the head of the tie wrap.
The diameter of the holes is 1 mm because each one has to accommodate both the LED pins and the wire.
Step 2: Drill the holes on the tie wrap
two 1mm diameter holes from side to side.
Step 3: Solder the wires to the LED pins
Wrap one or two coils on each pin close to the base of the LED and solder them with as few tin as possible. This will prevent the pin to grow too much in diameter to fit the holes in the tie wrap.
Step 4: Insert the LED on its holder
Since the diameter of the holes (1 mm) is almost precise for the pin an the wire together, you may find out that the welding doesn't let the LED to go further. Then just heat each pin close to the base of the LED with the tip of the soldering iron so when the tin and the plastic start to melt a little bit it's possible to push it inside. To do this hold the plastic head with your fingers pushing the LED vertically against the table.