Letter to PTG Technical Editor (fwd)

[McNeilTom@aol.com]

Hi, Steve, and List -

Here are two more shots in the dark:

The single most difficult-to-solve fuzzy buzz I've ever encountered eluded
several highly experienced technicians, including Yours Truly, for a couple
years.  We even worked in various team combinations, to no avail.  Turned out
to be a lump of hard glue on the shift iron guide dowel below the keybed.  The
shift iron would buzz against it, but only under certain conditions that were
elusive to duplicate. Seems like we could have zeroed in on it earlier, but we
could not.

Another buzz (in a 'D', but it could happen in a 'B' just as well) came from
the small hinges attaching the folding lip to the fallboard.  This was easy to
identify, and surely not the problem your correspondent encounters.  But, for
the sake of someone who might be helped by the info:  If you remove these
small hinges, you can un-pin them.  A small hammer, an appropriately sized pin
punch and a vise are all you need.  With the pin removed, you can use the vise
to pinch the barrels of the hinges very slightly to provide an interference
fit on the pin.  (Alternatively, you could install new pins a few thousandths
of an inch larger in diameter, if you have the right diameter rod lying around
the shop.)  If the lip of the fallboard is loose enough to fall of its own
weight, you might want to pursue this improvement, whether or not it's
producing noise at the moment.