How do you change to a zipper foot?

Clip it, Then replace with a New One.

"Most can Be found on Ebay or such Sites, If you Relay wanna Change it out I Reccoment using some Tin-Snips, Needle Nose Pliers, Or somthing to Cut it with Stongely

You will need to Cut @ Percicely the Right or Left side of the Zipper,

{_} <---- Just like this

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Then Twist to Remove.