Rick,

 

I don't really have much to add to the other comments, but since we're in the heat of summer I wanted to mention some tests I did on the fork oil used in the struts.  It's 30W BelRay fork oil.  It changes viscosity significantly with heat.  I ran temp test on it and posted the results to the Yahoo ES list so you can look them up.  From 60 to 120 degrees it loses 75% of its viscosity (or in other words it has only 1/4 the damping strength).

 

Most of the guys have added something to block lower cowl air from going down the nose strut fairing.  The oil is only in the lower portion of the strut so you can easily fit the baffle in the nose gear fairing.  Some guys simply stuffed some fiberglass insulation in the fairing, others have built tight fitting rubber or foam baffles.

 

The shimmy you describe sounds like it may be heat related.  A couple of the ES guys added the baffle in the nose gear fairing and got the shimmy to go away.

 

It's easy to test the strut with two pieces of metal and some grease.  The procedure is described in one of the Lancair SB's.

 

Even though you may have nothing wrong with your strut, other than hot oil, I still suggest you send the strut into Lancair and have the second O ring mod installed and have the inner workings examined.  I've been flying for about 100 hours with no sign of shimmy, but my strut is going back to Lancair at my next condition inspection in October.

 

Like the other guys said, this in not something to be taken lightly.

 

Mike