Old vs New--Lighter is not always better!
I just figured out why an older aluminum tube holds its position better than the new, lighter plastic "2008" tubes--the clamp provided with the metal tube has ridges inside where the clamp holds the rubber ball; whereas the same area on the clamp provided with the plastic tube is perfectly smooth! The ridges of the old clamps created indents across the ball's surface that prevented slippage.
I think I can best mimic the old clamp's "grabbing" surface by scoring the inside of the new clamp (maybe with a hot nail or Dremel) or with sandpaper. Gonna try that.
Also may try swapping clamp parts.
By the by, the T on the inside still limited placement.
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