AshleyR, there is a fella that stretches machines. It is the WOW and if I remember correctly his name is Rick. Also, there is a waiting list and the last time I saw a post about it they were waiting about 6 months...
Also, Billy on this forum (vintage machines) Lostn51 is his forum name has instructions to stretch machines. My DH wants to try one and he has a machine waiting for him to get busy....