Могу ошибаться, но это же self extracting cranks? Если да, то пыльник не нужно снимать - он по-идее должен вывинтиться вместе с болтом. Могу ошибаться. Это про старую втулку KH, но похоже здесь та же систЭма.
---------------------
The new KH hubs have a self-extracting system with the crank bolt. It pulls the crank off the hub when you undo the crank bolt. That dust cap ring is the part that makes the self-extraction thing work.
I assume that it's the standard size self-extracting dust cap. If that's the case, then you can go to your local bike shop and get replacements.
The local bike shop can also sell you the special tool (a pin spanner) needed to tighten up the self-extracting dust cap so it doesn't come loose again. Or you can make your own ghetto pin spanner with heavy guage wire from a metal coat hanger. Oh, and don't forget to grease the threads of the self-extracting dust cap before threading it on the crank.
-----------------
Это отсюда
http://www.unicyclist.com/forums/archive/index.php/t-38133.html