[TR] zenith or su's ?

[Randall]

>  A recording of 
> just the manual lift-the-piston button might not capture 
> enough displacement though.

Especially since it doesn't move during normal operation?

Something I've considered doing but haven't tried, is to modify a pair of
damper pistons to add an optical encoder (from cheap digital calipers
perhaps) that reads piston position.  That might also work with the web cam
approach, just a simple wire protruding through a hole in the plug to
indicate piston position.

-- Randall