you could try the electrolysis thing
Don't have an engraving machine, so I did the next best thing
nostr:npub18uan0zecrru99uv6f0x7e3kc6eglcu85delsvrt4gl209w7w8z2sgecjsn
#Nostr #Telegram Invite #Zap Card
https://video.nostr.build/9ecdfef2a0a8cc994304def7674aadf39caa2ce67921a84bf2d48184c9cf6f4d.mp4
Discussion
I have 9 volt battieres and the connecter wires, i should give this a try