"Bernard Arnest" wrote: (clip) Or more urgently, just tell me asap, is it
feasible to balance a castor wheel? (clip)
^^^^^^^^^^^^^^^
I once had to balance a fan that vibrated a lot--but the out-of-balance
weight was too small to overcome the bearing friction when the fan was
stopped. I held a vibrating engraver against the fan, and the thing slowly
rotated 'til the weight was on the bottom. A little work with a Dremel
tool, and the thing was fixed.