I have an older Gary Fisher that I am working on for a friend. He has a headset that is only marked Aheadset and Tange-Seiki, no model number or any other markings. The problem is that he is missing the top cap or the upper cover depending on what you call it. It is a lower end headset and my friend seems to recall it was a plastic cover of sorts. I called Cane Creek to ask about it and they have no idea based on how old the headset is. I am looking for a part number or a place to buy it on-line. Any ideas?