Headset "Dust Band" (?) Replacement?
 

My headset looks like this: http://i.ebayimg.com/00/s/MTU5OVgxNT...XD5jo/$_35.JPG
(note: the "dust band" (?) is missing from the top adjuster nut)
I'd like it to look like this: http://cdn.vintagevelo.co.uk/wp-cont...1/P1150582.jpg
(note: has a black "dust band" (?) around the top adjuster, covering the set screw which holds it in place)
I'd *love* to find an exact replacement part, but given that even *new* headsets like this are impossible to find, I assume I'm forced to improvise and make do as best I can.
My best attempt so far is a wide rubber band. It's a pretty good fit but it's blue and will need something like contact cement to keep it in place. Any better ideas? Has anybody here ever come up against this before?

A trip to your local hardware store or electronics store may be your best bet. Maybe some sort of O ring, plumbing gasket or drive belt would make a good temporary fix.

I have the same issue with a Mavic. Stacked O rings sounds good! :)

A slice off a large enough inner tube coould work, stretched over that gap on the headset.....

What diameter is it? Could a 1 1/8 headset spacer be modified to work?
How about a piece of black plastic with a drop of crazy glue on the ends - they make custom o-rings that way.

To make a good band, I would put a large-diameter sleeve of shrink tubing over the affected area, then shrink it with a heat gun.
Then I would remove the sleeve and trim out the part that fits where the band is supposed to be. Luckily the original is black, and gloss-black shrink tubing in large diameters is available. Perhaps a vendor could provide a manufacturer's sample of a short length of the product, then you could test it out and start producing and offering these replacements to the market.
Some Campag headsets have a similar issue with a rubber band covering an oil port.
I have some thick shrink tubing that it seems if I stretched it slightly might fit over a headset. I used a piece of it recently to modify the water spill-over level in a toilet tank!

Buy a piece of heat shrink tubing in the color of your choice. Cut it overly wide, fit it and shrink it to a fit with a hair drier. Then use a razor blade to trim it to a perfect fit.