Just got a few 3d printer nozzles that fit perfectly in an arras lamp, they are solid brass with a 0.4mm hole so not the prettyest flame but work well and very cheap! M8x1 thread
https://m.aliexpress.com/s/item/328...nozzle-M8-1-Threaded-copper-nozzle-Nozzle-0-4
https://m.aliexpress.com/s/item/328...nozzle-M8-1-Threaded-copper-nozzle-Nozzle-0-4