Objective: How to load a bobbin into a sewing machine.

Which of the following solutions is more sound in terms of naive physics reasoning?

Select from:
-- Place a wound bobbin into the shuttle, then load the shuttle into the bobbin chase and press until it won't unseat.
-- Place an empty bobbin into the shuttle, then load the shuttle into the bobbin chase and press until it won't unseat.
Place a wound bobbin into the shuttle, then load the shuttle into the bobbin chase and press until it won't unseat.