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Answer:
Generally, you will be told to squeeze a few drops of oil on the housing unit that the bobbin case sits in. Most machines want you to oil the shuttle hook (which is the thing that spins inside the bobbin casing). Often you will be told to drop oil inside the hook race and the housing of the sewing machine.
note: i jope it's help:)
it's base on my research po:)
correct me properly if im wrong:)