Originally Posted by
sreilly845
i know the quill/adapter isn't slipping because it has an inset bolt which pretty much leaves a pool to collect water and seize the bolt, so i glued a george washington dollar over it to keep the water out and his head doesn't spin when the bars do.
i've tightened the stem to neck of the adapter damn near to where i'm stripping the allen heads so i'm sure it's tight. i'm just gonna go with the explanation that it's too slick surface to surface.
i'm pretty sure it's the delta adapter, i got it for $10 when i was in a pinch out of state.
When you tighten the pinch bolts on the stem, do they go so far as to touch together? If so, you're losing clamping force and you'll have to shim it with a thin bit of aluminum from something like a soda can. If the pinch bolts are not touching, then I'd suggest picking up some medium grit sandpaper and going to town on the adapter to give your stem something to bite onto.