I've come to the conclusion by reading the book and looking a Aldens supp. 
plans that the vibrating length is 343mm between bridges no the wheel... The 
plans say the vibrating length is determined by the wheel which I know is wrong 
thanks to the supp. plans...  With that said..." Where does the wheel go?" In 
relationship to the front of the key/tangent box and the main bridge, I cannot 
find a dimention in the book for this spot.. I think it may have  been left out 
since the author listed the wheel as the vibrating length at 343mm...
   
  The book also says the distance between the wheel and the tuning box is 
343mm,,, Shouldn't that be the distance between the main bridge and the two 
smaller bridges at the end of the key box....    This is confusing...   Seth

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