My '85 Peugeot PH11 headlight setup:
(BTW, the bell is a "tangerine" Incredibell JelliBell)
To make this, you will need:
--- A polished stainless steel or aluminium led flashlight.
I used a Ese LZ2 Stainless Steel 1AA LED flashlight, which is no longer in production.
The "Ultrafire C3 CREE Q5 Stainless Steel" is similar, and can be found on ebay for $21.99
(edit: or here for $13.95, free shipping)
Also awesome would be the iTP A2 (or A1) EOS SS, widely available for around $32, or any number of other stainless steel flashlights. For more ideas check out this candlepowerforums thread
A polished aluminium flashlight would also work, but they seem to be hard to find.
WARNING: Stainless steel is heavy, due to its high awesome content. Weight weenies beware.
--- A copper "Milford" type pipe hanger. They look like this:
I found mine at Lowes.
--- An appropriately sized hose clamp, classic worm gear style. Also from Lowes.
(Note: There may be a snazzier alternative, perhaps some form of copper band, but this was the first thing that came to mind)
--- Felt. I used a very high quality dense felt used in piano restoration, but any sort of soft thick fabric, leather, or rubber would work.
Here is a better view of the construction:
-- If increased strength is desired, solder the joint in the milford hanger (it was wiggly on mine). If solder is not possible, I think epoxy would work. Solder is recommended.
-- Line the inside of the pipe hanger and hose clamp with slightly oversized felt- I used 3M Super 77 Spray Adhesive. Trim edges with razor blade.
-- Bend strap of Milford hanger approximately 1/2" below joint. I used vice-grip needle nosed pliers to grip as close to the curved clamp part as possible, and bent using the leverage of the strap.
Note: if you use a larger diameter flashlight, or one without the "hourglass" shape, you may need to make the bend farther from the clamp to provide adequate clearance. Or, spin hose clamp so the screw/gear is out of the way.
-- Trim strap of Milford hanger to desired length.
-- Affix hose clamp to top of handlebar stem.
-- Slide Milford clamp strap between hose clamp and felt, so when the hose clamp is tightened it does not scratch the stem.
-- Tighten hose clamp, insert flashlight into Milford hanger clamp and tighten screws.
Note: correct size of Milford clamp and hose clamp will vary depending on flashlight and handlebar stem size respectively
I will try and answer any questions, and feel free to offer suggestions for improvement!