Tube🌿Time on Nostr: here's what i'm trying to do. the top image is a normal via. you can see this is an 8 ...

here's what i'm trying to do. the top image is a normal via. you can see this is an 8 layer board, and the via has no connections to inner layers. it just goes straight through. then in the middle image, the gunk has etched out the copper in the top part of the via. in the bottom image, i've drilled out the material to expose fresh copper, then jammed a wire in there. there's a little solder which (hopefully) wetted to the via barrel.