What is that SMELL?

I spent too much money on this particular Singer 66 and it is in sorry shape.  I am willing to spend a buck on a check spring for it, but I am not willing to buy it a new motor.  So, what the heck, I took the plunge and opened up the motor.

Can you imagine what this must have smelled like when it melted?  This motor is trash.  But I haven't thrown it away yet.  I am studying it.   (Gee whiz, I must get a little tripod, or new glasses)