Another cause of nosewheel shimmy

We have a shop that's proved that shimmy isn't inevitable in Cessnas, as
other shops have tried to tell me in the past.

The nose gear started to shimmy after 18 months solid as a rock. Turned out
to be water in the wheel, trapped between the two halves and acting like a
wheel weight.

How it got in there is a bit of a mystery. Usually, it's from pressure
washing but we don't do that and we also don't fly in the rain very often.

--
Roger Long