To help assist you quickly, we will need as much information as you can provide. Even if all you need is a bobbin or a needle we will still need the MAKE and MODEL of your machine. Sincerely.
You simply move the screw to adjust the position of the actual foot. You can get as close or as far away from the needle position as you like.
DREAMSTITCH 161166 Slant Shank Zipper Presser Foot Fits for Singer Sewing Machine
Vintage Singer Sewing Machines: 161167 Slant Shank Special Purpose/zigzag/satin Stitch/applique/ Button Free Shipping
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HONEYSEW Straight Stitch Foot Slant Shank for Singer 290, 301, 401,4552, 4562, 4610, 4622 Sewing Machine 170071
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Singer 301A 401A 403A 500A 503A 600 600E Sewing Machine Zigzag Slant Shank Foot