On Tue, 5 Jan 2021 13:53:11 +0000, Tim Lamb wrote:

I'm struggling to understand what a chain could be attached to
stop
the lid dropping shut. Don't you need some form of strut? Possibly
an
"over centre" one. Two bits, pivoted center and each end with a
stop
that only lets the centre pivot go little past straight in one
direction.

Presumably the lid opens beyond 90deg.

Ah, possibly but then the lids is not acting as an operational
(partial) rain cover.

--
Cheers
Dave.