Because u said drop in coils I been wondering what u meant by that since my English ain't that wonderful. I found information about DROP rda and even a DROP rdta that makes use of the method drop in coils. Large post deck that allows u to build your coils whatever way u want.
I myself already make my own coil wire for my rebuildable options. (Rda, rta, rdta and large rba coil heads.) I don't mind, I like to play with the wire.
Did u meant something else by drop in coils? I can't find any information about except what I mentioned above.
Could u post a picture of drop in coils? I am very curious about how they look like.

I myself already make my own coil wire for my rebuildable options. (Rda, rta, rdta and large rba coil heads.) I don't mind, I like to play with the wire.
Did u meant something else by drop in coils? I can't find any information about except what I mentioned above.
Could u post a picture of drop in coils? I am very curious about how they look like.
