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Unfortunately, I was wrong.
Inner tube band on, clamp surfaces greased - and the chitter is still there!!!!!!
It is starting to do my head in.
The latest evidence would point to the sound coming from somewhere other than the stem hinge and clamp.
AAAAAARRRRRRRRRRGGGGGGGGGGGGHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
JurekB
edscoble
I'd agree, and therefore conclude it's probably ok, but it seems to manifests itself beyond an acceptable level considering your involvement and experimenting in trying to sort it out. Frame is guaranteed five 5 years, why not claim a new one?
If the crushing of the Brompton clamp had sorted it I would have also said the same, you shouldn't have to rectify the clamp opening along with the age of the frame, that's not what the design is intended for: the tapered contact surfaces between the hinge and the clamp should take care of any surface wear, like the (normal) loss of prefer coating in some area of the hinge.
The fact that the inner tube trick works is weird. And because introducing a spacer in the closed hinge seems to work, could it be that the hinge's spindle needs replacing as it maybe the thing that (if out of alignment maybe?) prevents a good contact in the closed hinge?