SINGER 319K - Manual (Page 53)

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Grasp light socket so that thumb extends over switch X2. Then press
shade with thumb at Y2 to release shade from two catches and slide it
halfway out of shade holder A3. Then press bulb into socket and at
same time turn bulb over from machine as far as it will go to unlock
pin Z2 (see Fig. 83). Withdraw the bulb.
To Insert a New Bulb
Press bulb into socket and turn it over toward machine until pin Z2
enters notch in socket (see Fig. 83). Return shade to its normal
position as shown in Fig. 81.
UNLOCKS
Fig. 83. Locking or
Unlocking Bulb Pin
Fig. 84. Inserting
Bulb in Socket