Battery "free" Bike Light.

  Step up and get your own "dynamo hum"...(FZ).  All jokes aside, its a simple dynamo light mounted to a Planet Bike light bracket.  On about 6 cranks I get 20 to 25 minutes of light.
  There is a 3.6 volt NiMH rechargeable battery that comes in the light.  SO, by free I refer to your out of pocket cost on batteries.

1. dynamo light....Harbor Freight, 2 for $8.
2. quick release light strap...most have a screw to change the mounting base, this is a Planet Bike
3. super glue
4. fingernail polish remover........or acetone

Remove the screw and discard the top thin portion.

Use a knife to take any high points off of the base.

Take the 4 screws out of light.
Be cautious not to let any gears or gear shafts to fall out.

Using a hole punch I twist and push a hole through the plastic, working from both sides.

Using the fingernail polish remover, I clean both surfaces.

1. I put glue on the base only.
2. Screw light cover to base.

Once glue is dry, put your 4 screws back in and your done.

The law (here in Arizona) says you need a forward facing light visible from 200 yards.  This covers that and I only need a rear red reflector.  So, I'm now battery free!