Welcome to Quilting Board, 70suslise. While some of the Yahoo Groups went to io.groups, some went to facebook. The one Cari recommended is
https://www.facebook.com/groups/821555271188096/ There is another at
https://www.facebook.com/groups/659877447448317/ and then the io groups is
https://groups.io/g/vintagesewingmachinerepair
When Yahoo Groups got discontinued (about 6 years ago), I didn't go over to any of them.