You all know I just LOVE vintage sewing machines. When I see them at the thrift store, I always buy them. I give them away, I keep them and yes, I even sell them! I own a lot of them. I love figuring out how to thread them and share them with you in case you own this machine!
Here is the White Model #3800 and how to thread it properly. Maybe you own it and are struggling to thread it right? I hope this helps! I demonstrated the top threading, as well as how to thread the bobbin.