Thank you Weedwoman and Glenn for getting back to me so quick. When I bought the machine, they gave me a screw down seam guide. I'll get that sucker out and get it measured this weekend. They insisted at the shop that the zig zag foot was exactly a 1/4" and it really isn't.
I see there are a ton of different feed dog covers at that site. I bookmarked it for later drooling. Am I just looking for one that's compatible with a 66?
Those red eyes are so pretty. Mine is a shiny black one and all her finish is silver. I was looking on some earlier posts and they were talking about the reverse lever painted white. I don't think mine is. She's from 1954.