Not to state the obvious, but I noticed this exact effect after lubricating my hinges and flying for a few hours.  Also, as mentioned, it is a well documented problem (but not at 30 hours assuming no binding).  I have installed the teflon hinge kit sold by Gary Hall? in Florida, and have had no material wear in over 400hours since installation. 

 

Chris Zavatson has done a lot of research on this hinge problem, and has another possible solution:

 

 

 

Regards,

Clark Baker

 

 

 

 

On 2/19/07, Marvin Kaye <marv@lancaironline.net> wrote:

Posted for John Spry <spry@paradise.net.nz>:

I've done 30 odd hours in my recently completed 320 (small tail) and notice
grey streaks (aluminium I think) coming from the outboard elevator hinges .
Everything seems tight - has anyone got any ideas what may be causing it and
the best fix.