I don't know about using a zigzagger for a walking foot, I've always thought of it as a neat thing to have but not something to use. This is the walking foot I have for my straight stitch machines:
http://shop.sew-classic.com/Low-Shan...tch-P60400.htm
It works just fine on a 201, I just used it on mine for 2 baby quilts.
Cari