I have the same. Been trying to figure out how I can replace it with romex without tearing out my plaster over expanded metal walls. Most of the duplexes run through the bottom wall plate to the basement where I have easy access to wiring. Just can't figure out how I could run wire back through the existing holes and snake new wire 12" up to the duplexes with the existing wire being stapled to the studs. If it's loose enough I might be able to attach new wire to the end of existing wire and pull it back through since romex is thinner than the cloth wire.Reminds me of some of the wiring in my house. It was that stupid non-grounded cloth wiring, where most of the junctions were strips and splices wrapped in a crap-ton of electrical tape. Tore all that stuff out and replaced it with proper Romex.