Luke,
Hmm...odd. Mine isn't numbered like that with consecutive page numbers for the whole manual. Section J is titled Frame Unit and pages 1 and 2 have Figure 1 which has all the dimensions. Pages 3 through 7 of that section contain the description and additional information on checking the frame with figures 3 through 5.
Mine is the Brooklands version (same ISBN number as on Amazon's site and Brooklands information on the last 3 pages). Maybe you have a different version or a misprint that's missing those pages with illustration 1?
Unfortunately, the illustration covers 2 pages right in the middle of the manual and the measurements are in a really small font so I don't think that I could easily scan it.
Scott