Here more info and here the current available post processor list.
Let's say , for example, when you need a face turning operation .
Check to see what drives the machine as it may be Belt-Driven or Gear-Driven.
Is there a RUBBER BELT that connects the motor to the Hand-Wheel?
, you have a Singer Model 27 or 28 or one of their variations such as the Model 28K.
Look at the pictures below to confirm your machine's identity. You have indicated that your machine has the "D" shaped Needle Plate. If the Sewing Bed is 14 to 16 inches (35 cm to 41 cm) it is a Full-Size.
Now open the slide plate and look at the Bobbin Case.
Locate the Bobbin Position Finger and note in which direction it is pointing.
Check to see how your machine is powered and choose the answer that best describes how your machine is powered.3. Check to see what drives the machine as it may be Belt-Driven or Gear-Driven.
You have indicated that your machine is Electric Powered. Is there a RUBBER BELT that connects the motor to the Hand-Wheel? You have indicated that your machine HAS a Rubber Drive Belt.