The retainer clip should be on the middle notch.
To get the choke slug out, you will need to use some penetrating oil and let it soak for at least 24 hours, repeat as necessary to get it out.
another question! witch side i but the little magnet!?? those it matter? one side is positive and other are negative? If i use a ohm meter and i test the connection need to be close when the feeder is not apply wright??