I free motion quilt on some 301s. If I do straight line quilting, I use a vintage Singer walking foot that I got on ebay for about $20. I screw the feed dogs down. I FMQ with an all metal foot that I got from sewingmachine221sale.com for $20.00 with the feed dogs screwed out of the way. I get perfect results. I used to have a FMQ foot with a plastic bottom that gave me troubles, the metal open C ring is much better. You don't have to worry about the presser bar with the FMQ foot because you are moving the fabric and the foot is just hopping.