After you oil the machine, warm the ZZ parts with a hair dryer. I recently had to do that with a Universal that thought its ZZ days were over. Worked like a charm.
My Elna is newer than yours - the 62C (light blue), but it can't quilt at all. The presser foot pressure is self adjusting and is too tight for good piecing and FMQ. Being a ZZ machine, it also eats corners on HSTs.
My FMQ machines are a pair of Singer 301s. I have also used my Necchi VN which is an older single stitch machine - probably about the same throat space as a Singer 15.
It sounds like you are enjoying your venture into quilting. Welcome!
Last edited by Irishrose2; 01-25-2019 at 08:28 AM.