So the Duex didn't come with any additional twin ferrules, just single wire ones. The Duet Wifi came with two of them, but I already used them when I originally set up the duet. I tried taking them off and seeing if I could salvage them, but it's not going to work.
I ordered a ferrule kit the other day and it should be here today or tomorrow. It's only single wire ferrules though. So I have two questions.
A) Could I use a single wire ferrule and then attach a piggy back connector and have two wires going into it?
B) Could I use a larger gauge ferrule, say 10 or 12, and then a little electrical tape and heat shrink tubing?