"donb" wrote in message
...
Both of my Ultegra/600 shift levers (circa 1998, 8 speed) frequently won't
shift down, particularly when it's cold outside. Both small inside levers
move through their full range, but it's as if there isn't enough friction
and nothing happens. Is there anything that can be done to increase the
friction or otherwise fix the problem?

Thanks in advance.

Move south OR flush out the cable housings, front and rear (or replace) with
some WD-40. The Shimano cable lube that comes with the levers when they were
new slowly turns into glue. Replace the cable at the same time unless it is
reasonable new. Ten bucks and you should be good to go.
Bill Brannon