I have a mini electronic sewing machine model FHSM-202 and I can't for the life of me work out how to thread it. The instructions stop making sense at stage 4: 'thread goes over tension adjusting screw (Q) and must be positioned between the two washers behind (Q)...etc' What is the tension adjusting screw? What are washers? And why does the threading diagram not seem to show this step at all? The thread doesn't go anywhere near the foot until the end but the diagram indicates (Q) is on the foot....I'm so confused! Thankyou...