Aporte original por: Ronald Drysdale

Texto:

Hi, this is the actuating pin from the thread tension assembly - when you lift up the presser foot hand lever the upper thread tension assembly should slacken after being activated by this pin.

The pin is situated within the screwed shaft at the centre of the tension assembly and this is pushed by a cam on the lift up lever.

You can see this if you take off the needle bar/presser bar face plate.

Estatus:

open