Hi everybody, I been trying to find the source of some top end noise and when I was setting my valves (.06mm intake, .15mm exhaust) I noticed some damage to one adjuster screw. Someone told me its possible to put the screw in a drill and polish it back with sandpaper? I think this ones too far gone as iv read that the hard layer on these is very thin. I know I can get a replacement from Mike's but I seen a few posts here about them being soft and poor quality. Anywhere else I might look? other than ebay.