chris French wrote:

we have corded rails in some of our windows, nothing with
such a sharp bend though - 45 degree bays.

The corded arrangement was working fine. though we now have some
failures, the weak bit being the little bit of gubbins where the
vertical cord goes horizontal. There are little plastic wheels and
things in there which have just got to worn - suspect these are probably
at least 20 years old though.

I have a couple of Swish corded tracks of similar age, the plastic has
reached 'that age' where the hooks and brackets are starting to snap-off
at the slightest bit too much pressure.