There are many other vintage machines that are better suited for FMQ. Not only do you have to contend with a super small throat space, the bobbin is drop in and not the best choice for tension during FMQing.

Welcome aboard T J! Not much to add here except if you're looking for a better machine for FMQ you might consider a Singer 15 or one of it's clones. I like the job my clone does and other people like them as well.
Rodney

Sew-Classic.com now has the replacement pulleys and I have ordered one for a White Rotary.

My wonderful Elna 62C (1973) can't piece or FMQ. The presser foot is 'automatic' meaning it adjusts the tension to suit what's under it. Just firm enough to shift little quilt pieces slightly and with the ZZ size needle hole it eats corners of triangles. It's okay, the 301 does both those things well and Miss Elna does everything else from silk organza wedding dresses to leather belts. Handles stretchy knits wonderfully.