Randa,
I think I see two problems. First the tension looks like it is missing the second metal plate which sits below the plate with the slot. The tension is created by these two plates pressing on the thread.
Second the thread passes to the left of the broken wire. As it passes it slips to the right to catch the "take up spring"
(the bent wire that moves left to right). It looks like the thread is correctly on the left of the top of the broken wire, but on the right of the bottom half. It needs to be to the left of both halves so that it can correctly pull the movable spring to the left at the proper time.
Easy for me to see and understand, but next to impossible to explain in writing. I hope I didn't completely confuse you.
Cathy