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I managed to repair the damaged part with a little solder and a 0.4mm PCB drill bit on a pillar drill.
Unfortunately the bike is still not running after cleaning all the carbs and jets. Bike will idle with choke open and that's it.
The carbs were pretty badly varnished.
Ordered a set of rebuild kits and will just replace all the jets with new ones. Should hopefully ensure the bike will run. At least it will take away the question of are the jets cleaned properly.