Anyone else having problems with keeping their headset on the 05 450 tight? When I brought my bike home from the shop the headset was loose. Bought the little spanner wrench to tighten it up...Took the bike out for a 5 minute spin and came back to find the headset had loosened up again. So I went to tighten it again and cranked down pretty firm on it this time. It has held for two rides, but is now loose again. Is there some sort of trick in keeping this thing tight that I do not know about?