<html> <body> Hello Peace Sarah- Are the keys on the Hamilton weighted to self-return, or do they drop to the front rail with the action removed?  I only have a Grotrian upright here right now to observe, and this one does indeed return without the action weight.  That makes any slight lost motion more effective.  Without it, the jack still has to work to either push the hammer up or the key down. Happy Holiday David Skolnik At 01:21 PM 11/23/2004 -0500, you wrote: <blockquote type=cite class=cite cite>Hi David,   I wasn't sure of the description myself, but I know *my* 60's vintage Hamilton has this problem of jacks sometimes not fully resetting on slow release.   You wrote...   >>If there is not enough (just enough) lost motion, the jack will not return under the butt on a slow (soft) release.   ... which was once exactly the problem with my little Hamilton.  It was aggrivated by higher humidity.  As I recall, the Hamiton butt leather isn't really leather but is some synthetic stuph.  Perhaps it expands somewhat with humidity???  Anyway, the cure was to add a wink more lost motion, at least on *my* piano.   Peace, Sarah  </blockquote></body> </html>