I recently searched somewhere - I guess here but I could be wrong - for creaking HBs because my new Nitto set up was making lots of noise. Anyway, I gathered that it might be a case of not having all the bolts tightened down enough. I lubed it up and cranked down on my stem and the creaking went away. You might want to try that. Bear in mind that my stuff was brand new but bolts do have a nasty habit of losening up on you.