SINGER 484.1244180 (Sold at Sears) - Manual (Page 9)

Changing Snap-on Presser Feet
The accessory feet supplied with the machine fit
onto a common shank and are attached easily
as follows:
Raise needle to highest point by turning the
handwheel towards the operator.
^ Raise presser foot using lever on rear of
machine.
^ Push up on toe of presser foot (1) until it
snaps off shank (2) and remove foot.
* Place new foot on needle plate with pin (3)
under center of shank.
^ Using presser foot lifter, lower shank onto pin
(3) and push down firmly on presser foot screw
(4) until foot snaps into place onto shank.
Changing Screw-on Presser Feet
Special feet which have built-in shanks are
replaced as follows:
^ Raise needle and presser foot.
Loosen presser foot screw (4) with a coin and
remove presser foot with shank (5) guiding it
towards the operator and to the right.
^ To replace foot, hook it around presser bar
(6) and screw (4). Tighten screw with a coin.