Jurgen Goering wrote:

> I have a Poppers instrument missing a ladder chain.  The links
> are quite large: 13 links in 10 cm (4 inches).

Hi, Jurgen, and MMD.  13 links in 10 cm works out to 39 links
per foot (US measure).  S. LaRose, at http://www.slarose.com/ ,
a clock parts supplier, sells ladder chain with that pitch.  It is
their stock number 206.

For all of us who are restorers of mechanical musical instruments,
there are many mechanical parts such as the chain listed above which
are no longer sold specifically for mechanical musical instruments,
but are still made and sold for clock repair.  The LaRose web site,
with its on-line catalog (as well as their printed catalog, called the
"Keep Book", US$2.50) is a great resource for that sort of material.

Disclaimer: I have no connection with S. LaRose other than as a
satisfied customer.

Regards,

Bob Loesch
http://www.jps.net/rrloesch