Missing lock nut part on Dura Ace WH-7900 wheels Not sure what to call it, but a couple of my wheels are missing the grippy washer thing that sits on the lock nut. They seem to be attached to the lock nut to begin with, but they just fall off after a while and get lost when swapping wheels.

Can they be replaced?  If so, where can I find the replacement part?

With:



Without:
It looks like the washer in your photo may be a "Wedge-Lock" washer like those available here: http://www.mcmaster.com/#standard-washers/=xhptlp


They appear to sell under the names "Heico-Lock" &amp; "Nord-Lock".
This may be a UK source: http://uk.rs-online.com/web/c/fasteners-fixings/nuts-washers/locking-anti-vibration-washers/

I should note that there very well may be a similar looking shimano specific part that functions differently &amp; that I am not familiar with. I'm basing this suggestion solely on appearances.

If someone knows that these are in fact not the same as the item pictured by the OP, please enlighten me!

EDIT: To add further to possible resources, at the bottom of this page: http://www.heico-lock.co.uk/products.html There is a list of "Wedge Lock Nuts &amp; Wheel Nuts" (Nuts with an integrated washer half). I do not see any resale links though...