You should be able to buy blued steel from supply houses,
Cousins in the UK sell it
https://www.cousinsuk.com/catalog/consumables/brass-steel-bushing-pin-wire
Look down the page under the brass wire.
Paul.
You should be able to buy blued steel from supply houses,
Cousins in the UK sell it
https://www.cousinsuk.com/catalog/consumables/brass-steel-bushing-pin-wire
Look down the page under the brass wire.
Paul.