Does anyone know any good ideas on how to stop an annoying squeak/creak coming from the major pivot point connecting the the two halves of the frame. (Just above the crank). The noise occurs when you are pedalling hard. I have changed all of the bearings, but it hasn't gone away. It will go away if you squirt some WD40 into it, but this messes up the bearing, as you need to loctite it to secure the bearing on the inside of the barrel at the pivot point. Thanks???????????