SINGER 6510 Scholastic - Manual (Page 12)

Raise the presser foot clamp "a". (1) Attach the presser foot
holder "b" as illustrated.
Attaching the presser foot
Lower the presser foot holder "b" until the cut-out "c" is directly
above the pin "d". (2)
Raise the lever "e"
Lower the presser foot holder "b" and the presser foot "f will
engage automatically.
Removing the presser foot
Raise the presser foot. (3)
Raise the lever "e" and the foot disengages.
Attaching the seam guide
Attach the seam guide "g" in the slot as illustrated. Adjust
according to need for hems, pleats, etc. (4)
□ Attaching the presser foot holder
Attention:
Turn power switch to off ("O") when carrying out any of the
qtions! above operations!