SINGER 2517 Merritt - Manual (Page 70)

SÌNCER
Lubricating the machine
Approximately once a year, lubricate all moving
connections, as shown, to ensure freedom of movement
and to protect metal parts from excessive wear.
To determine which connections move and need
lubrication, turn the handwheel slowly, by hand, while
face plate is removed.
When lubricating, apply only SINGER oil at the points
shown. SINGER oil is specially prepared and does not
contain harmful deposits that can interfere whith the
smooth action of precision parts.