take of fthe cap to oil. you can pull the give knob right off. also oil in the front where the nipple is on the slides. here's the instructions from ink machines:
  1. Remove grip and needle.
  2. Remove the cap and push the piston assembly  down to the bottom of its stroke
    by pushing on the needlebar pin and lube with a small amount of oil in the
    corners between the piston and the housing. Put the cap back in place.
  3. Apply oil just above the needlebar pin in the oval hole.
  4. Apply oil on the bearings  of the needlebar retainer  and roll the bearings a
    few times back and forward to let the oil run into the bearings.
  5. Run the machine between 9-12 volts for about a minute and clean it when done.