Thank you Three Dog Night, that looks like a very helpful site. I could not find a video 52 but will take some time tomorrow to do a better search. There is info there other than free motion quilting that will help me as well.
I looked for a straight stitch needle plate. They are expensive! The best price I could find was nearly 40 dollars and shipping.
Would still love to hear from anyone who has used any Pfaff free motion feet other than the Sensormatic foot.