........ And when cranking, don't wrap your thumb around the crank! The fella I worked for as a kid had a Farmall and it rarely had a good battery in it (they cost money  <!-- s:roll: --><img src="{SMILIES_PATH}/icon_rolleyes.gif" alt=":roll:" title="Rolling Eyes" /><!-- s:roll: --> ) so I had to crank it and occasionally it would kick back.... ouch! 
I have a 37 HP-70 but the crank is gone which is ok as It has a good starter.I am not sure I would like to try cranking that anyway.
  You might check with Floyd County Museum to see what manuals they might have. If not originals, they may have reprints.
                     Cal