First thing - Never lubricate moving parts on a SS and later machine. The pop bumper could be weak due to the coil sleeve, worn plunger or years of lubrication. Check to see if the rod and ring moves up and down without any friction. Then clean the plungers and replace the coil sleeves.
Before any of this, ensure the gap is correct on the switch, and that the spoon is correctly aligned with the pop bumper skirt.
