You can spray rather liberally, but be carefull not to get the thin spray can stuff into the motor (it's set vertically under there). In theory you should get the same result with basic sewing machine oil, or Triflow, but the spray can stuff speeds things up. For areas that are greased it needs to be cleaned off before regreasing. The worm gear is greased to begin with, and likely needs a clean up and new applied. It's not often it's gummed up totally, and I would clean everywhere, double check for dust, threads and lint before I sprayed and oiled any further. Spray can stuff seeps in every where.