I have a 550 from 59.  One side wheel turns a little then it locks up like something is stuck in the gears but it is only one side.  The guy we bought it from said it was a common issue and said it is just the brakes ratchiting up and said to take a hammer and tap the hub while moving the wheel.  Sounds cheezy to me.  The wheel turns some to the front before locking but doesn't turn to the rear at all.  Sounds like something getting in some teeth to me but I have been wrong before.  Any ideas on this?  Thanks much.gp <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D -->