I have a 2012 XTC composite 29er that I've been riding for the past 2 years and the headset has developed a clunk. I've replaced the cartridge sealed bearings so far and greased the cups liberally but it didn't fix the problem. The Lower aluminum bearing cup is very tight in the frame, but the top cup easily comes out and I believe the play is due to this. Is there a shim available to keep the top cup tighter in the frame? I hope I didn't slightly ovalize the top of the head tube. Any thoughts?
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