How to change needle on Union Speical 39500

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Hi I have a union special 39500. It has a curved needle. I can not
figure out how to change the needle. There is a small hole that that
needle bumps against on the screw. Does the needle  go in there? I
have tried many times  putting it in the hole or either putting in
this ridge that is there and either the needle over shoots the hole it
is suppose  to go in or it is too far to the left. Please if anyone
know if they could let me know.

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