Posted for "Gene Martin" <genemartin@enid.com>:

 If this is the stock friction trim the push tube clamp may be loose or broken
and slipping on the tube,the plastic clamps were prone to cracking.
 Gene Martin
 LNC2,N522RG/320

"""
  Second, the airplane can not be trimmed to level flight at high speed. With
the trim full down, the stick must still be held forward to keep the nose on
the horizon. We discussed installing a stronger spring on the trim system, but
I told him we should ask the experts about this first. What's the best way to
fix this?
"""