New Kaskara, repair baldric???

[Rick]

When I used to shingle roofs and sidewalls in my 'yout' my Boss's watchword was "think like a rain drop" .

In this case I'd offer 'think like a conservator.'

Ah , we're overlapping .
If you were to put a patch on the underside I'd still consider backing it up with some flexible adhesive between as the strap looks very dry and brittle .