If you have the model # NST2018 then the only thing wrong is that a .30 cent retainer clip at the upper end of the spindle shaft is missing. A local hardware store should have one that will work. There should be a thin washer that will go between the sleeve bearing and the retainer clip that will be inside the housing as well.
I replaced the spool arrangement with an adaptor that uses 2 pieces of string. After years of use it...
(More)
I replaced the spool arrangement with an adaptor that uses 2 pieces of string. After years of use it wore out and now I don't know how to remove and replace the adaptor