Info needed: Ford CMP horn- diaphragm replacment or repair

[Jacques Reed]

Good Day,

Does anyone know where to obtain a new or repro horn diaphragm for the Ford CMP trucks Part No. 78-13812?
The one pictured has been perforated by rust which only became evident after a good chemical cleanup.

I tried the usual vintage Ford parts supplier as it appears to be a standard Ford part and not specific to the CMP's, ie. no asterisk in the parts list. Plenty of horns but no parts for them.

Alternatively can they be repaired? I thought about brazing it but it is spring steel and may destroy the temper. Solder, though a cooler process, may be too soft and fall out when it vibrates. Any epoxy material will probably do the same I would think. Anyone used any of those processes with success?

Any help gratefully received.

Cheers,