On Mon, 14 Feb 2005 10:06:01 -0500, ge wrote:

We have a couch (of undistinguished lineage), which we had
re-upholstered about 15 (?) years ago. It's now sagging badly.
Looking underneath, the problem seems to be that the webbing is coming
loose. Without being overly judgemental, there might have been some
quality issues in the repair - the webbing strips have only two tacks
in each end, and these are pulling out. So, I have some hope that we
could just re-attach them, and get back to a useable couch. In that
light, ...

If it was a mediocre couch to start with, and the REPAIRS lasted 15
years, I'd have to say you've gotten your money out of it.
As for re-using the webbing strips, if they're tearing out, then
you probably want to re-enforce them before tacking them back
on. Either that, or back them up with parachute cord stapled on
with a robust staple gun.