| Carl:
Older tires in which the tread is loose, moving, and squirming can also
cause this shimmying.  It can happen on tires 7-8 years old.  It
happened to me on some lower mileage pickup tires that were less than
ten years old.  I had to throw them away before they were worn out. 
They were Goodyear steel belted radials.  It's sometimes hard to tell
visually.  Have him switch the fronts to the rear.  I did and it helped
for about a year.
Blake
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