In uk.d-i-y Howard Neil wrote:
Ian Stirling wrote:

The plastic in some areas is quite degraded.
The south-east corner has perhaps 1/3 the pull-through strength of
the north-west one.


How about lacing in a new piece of poly? Mind you, that sounds a real
challenge to the system.

I have a replacement cover, which is going to be put on at some point.
Replacing bits would be slight overkill.
However, on one end, it's probably going to get the old cover moved inside,
to form double glazing.