thanks for your responses guys, I look into the de-burring route - seems like a lot of hassle that should been addressed by the manufacturer - but then again the price was pretty good. I am gathering some interesting feedback from the various boards I have posted the question. Seems like the buzzing is common, but not inevitable. If I get a definitive answer I will tack it into this thread for anyone who is interested. BTW - the supplier of the discs says that he is sending me a set of replacement discs immediately - if this is the case, I am impressed with his service and I will post his details here when I receive them. Spin |