Purpose of a non spring action, fixed height free motion foot is to hold the fabric flat at all times.
Does not allow the foot to hop up and down on the fabric which can cause catching fabric or thread skipping, shredding, and breakage. Purpose of a spring loaded free motion foot is to prevent needle deflection in fabric, holding the fabric down in place while needle is entering and exiting the fabric.
Brother "U" Embroidery / Presser Foot NV500D/NV1500D/NV2500D # XD0313051
Guaranteed to fit Brother Sewing Machine Models:
NV1500, NV1500D, NV2500D, NV2800D, NV500D