No. A double lead cord is a cord that plugs into the wall, and the other end has the foot controller attached. A Singer 221 has that kind of cord, as do some 15-91's and 201-2's.
I have a Singer 201-2 that has the SINGLE lead cord configuration. The foot controller cord is a separate cord that is wired into the machine. I am wondering whether or not I can remove that attached foot controller cord completely, and use the double lead cord configuration.