Originally Posted by ghostrider
When the foot is down, the tension discs are engaged and you are putting undue stress on the thread and the discs when you pull it to thread the needle. This is true for any sewing machine. I think your repair guy's explanation is right on and you should listen to him. I never thread machines with the foot down...it's like pushing a car with the brakes on. :D
You explained it very well. :D I have done it by mistake once or twice, and I worry that it will hurt my machine.