The driver thought he'd just cracked the outer casing. In fact most of the mirror had been diagonally severed from its mountings - only the broken outer casing kept it from falling off!
Used my go-to adhesive, Stixall. This sets to a tough, strong rubbery finish, and whilst I'd have preferred to have used a hard-setting product, it was the best I had available to me. I also cut short lengths of thin but stiff SS wire I had, and bedded them in the Stixall at regular intervals to 'stitch' the break together.
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Not pretty, but hey.
I think I'll also Stixall the outer case into place around its perimeter, as this should help the overall mirror strength.
On the replacement cover - it cost around a £enner on t'Bay - it has a great finish, looks like a decent quality moulding, but is clearly much thinner than the original - see photo.
Looks pretty thorough!!