I checked about 6 Singer cabinets, and all have the two outer on the cabinet and the one inner on the flaps.
The cabinets ranged from early 1900's treadle to mid 50's electric, both single flap and double flap styles.
The White cabinet I have in the house is also this way, however the National I have in the house is the other way - I can check the other non-Singers later, when I get out to the shed.
Last edited by Macybaby; 06-08-2015 at 05:02 AM.