Make sure that a 1.1 mm (1/32 in) diameter drill bit will go through the nozzle hole (A) (1.3 mm (0.051 in) diameter).

Make sure that a 1.9 mm (1/16 in) diameter drill bit will go through the oil intake (B) (2.1 mm (0.083 in) diameter).

Insert a 1.9 mm (1/16 in) drill bit into the oil intake (2.1 mm (0.083 in) diameter). Make sure the check ball (C) moves smoothly.