I have been manufacturing something similar for a couple of months now, have a look at the following thread :
http://forums.mtbr.com/showthread.php?t=672117
I have described the process and product here:
http://www.ofanaim.net/has.html
I am an engineer, and in my free time, I am designing parts for
improving bicycle performance.
I was surprised to see how many people were interested in the product. Currently the product is not cheap as the demand is not high and this is a taylor made product.
However, if even half the people who showed interest would order one, that would change the picture completely!
If you would like any more information, please dont hesitate to contact me at
saar@ofanaim.net
Regards
Saar