Underwood self adjust.    I picked up a 1941 Underwood Standard a few months ago at a thrift shop--needed cleaning of course.  Thought I was a good cleaner, and went to work.   I liked the action.  But...the upper case and lower case letters were not alighened.   Upper case was too high.  I tried everything to adjust it; got service manuals on line.  Nothing worked.  Finally, I packed it up and drove it 400 miles to a repair shop.  When I got there and explained my plite to the repair an, and showed him the machine...he type was aligned.   I was amazed!  I felt like a fool.   Did the vibration of the drive adjust the machine?   The repairman suggested a cleaning, as, he said,  a cleaning cures many ills. So agreed. and $80 later I walked out comfortable.   I did like the action of that typewriter.    
    The question is,   did the vibration of the drive adjust the typewriter?