I have also had this problem! The measurements are wrong! I went to the outer edge measurement as this was easiest to measure and work to. But if you think about it the plates are 30mm wide so centre holes are 15mm in, take this(15mm either side) from the outer measurement(285mm) it does not give you 258mm! It's gives you 255! I presume the measurement of the rack is 258mm? Things like the really annoy me as you don't know it's wrong until you have done the work then scratched ya head for hours and remeasured your work time and time again!! Glad I didn't pay for the book!
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