Size 207 thread is at the upper limit of what your machine can sew with. You should go very slow when you sew with it.
When you finish sewing and want to remove the work, you need to lift the foot up to its highest point, either with the knee lift or with the lever on the back of the machine. This releases the two upper tension disks which releases the top thread from the upper tension. After you do that, sometimes with any size thread, you may need to advance the hook with the hand wheel slightly by pulling it back toward you, as you pull the work out, to release the thread. As you pull the hand wheel back, you will feel the thread come loose.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 06-23-2011 at 11:04 AM.