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The WD Motorcycle forum
Dave, this old discussion has some good dimensions info and touches on the 1 or 2 washer topic. HTTP://pub37.bravenet.com/forum/static/show.php?usernum=3155626639&frmid=16&msgid=1253103&cmd=show Item 46 is very important as if that is left out the speedo drive can be deformed (as was done on one of my M20's at some point).