(1) Each oil hole on the machine head lubricates the upper shaft and the parts connected to the upper shaft.
(2) The components inside the panel and the moving parts connected to each component. Lubricate the presser foot bar and needle bar and the parts attached to them.
(3) Clean the movable part of the lower part of the machine plate and add less oil.
The amount of refueling in each refueling hole and refueling part does not need to be too much, just one or two drops.
