Fuel Sender Unit

[SVX99]

I think I have found the problem with my fuel sender not working properly. It has worn contacts.

First photo is from a forum post I read which shows the intact knob at the end of the contact and second photo is my worn one with some "Devil horns" of copper left at the end.

Obvious get a replacement part is hard to do in Australia (only 249 SVXs ever officially sold here).

Normal solder will work but probably won't last as it is soft.

Copper solder would be better but you need a blow torch to melt and that could damage the plastic part.

Any suggestions to fix?