Perhaps some MMD readers will find this note interesting.  This Zamac
alloy sounds like a trouble maker.

Jack Hardman

> From: David J. Dewey <djdewey@ecst.csuchico.edu>
> To: 'livesteamers@uwimona.edu.jm'
> Subject: Zamack & similar alloys (Pot metal)
> Date: Friday, July 11, 1997 11:16
>
> Had an interesting clinic the other day at a Piano Technician's
> meeting (Piano Tuners).  It seems the Young Chang company had a run of
> piano action brackets about five year ago where something wasn't quite
> right.  These brackets are an alloy, as are the current ones.  The ones
> in question are "growing", and making the pianos unplayable.  The 'cure'
> is replacement with identical-looking alloy new brackets.
>
> What I find interesting is the short time it has taken for the brackets
> to start swelling.  With modern production controls, mistakes still
> happen, and what was thought to be a stable material, wasn't.  Makes
> one a bit leery!