A perfect dial cord material is the cord used in parallel rule devices
used on drafting boards in place of t-squares. Some schools still use
parallel rules instead of computers in drafting training . This cord
is perfect. It has a steel core and a plasic flexble sheath. Although
the draftsman has been largely replaced by the CAD operator, some
office supply stores and such may have some old stock sitting in the
back room. It is worth a look and the schools that still use parallel
rules will be getting replacement cord from somewhere. There is about
25 feet of cord used in each parallel rule, so an out-of-service rule
would also be a good source. All the drafting supply stores I once knew
are gone now, but the cord is too good to throw away.