Interesting image......not sure though the rims on outside and inside are correct? I'm saying the diameter doesn't look right compared to my original image (note image is clearer in book)
Here's a photo...I tried to enlarge it using Photoshop Elements but it was too big for web or something.
Maybe you can copy the image and edit it? These Black/White images are hard to get clear (I'm still a rookie with Photoshop).
Paul