I needed to attach a block to the bottom front of my headlight to raise it, on first draft it lit right in front of the front tire unless I looked at the sky. I had checked the aim at home, but had not thought about how your head is held differently on a bike with relatively low handle bars.
Step 1: Parts
you may already have some, if so, use them. If you don't have any, choose some that appear "modifiable", e.g. screwed shut.
for simplicity, make sure both use the same number of batteries. Mine both use 2 "AA"s
- 4 solar panels (2 might do)
I got mine from cheap-o yard lights from a sale at Canadian Tire, ~3$ a pop. You might find some in the garbage, some people throw them out when the rechargeables die or after the get knocked over and break
- 1 diode
scavenged from the yard lights as well
I used some old phone wires, small guage will be fine
- double-sided tape
I also tried zip-ties but the tape seems to work better
- metal duct tape
not the plastic stuff... this will be used for circuits. Other thin metal sheets glued on would work too.