I was just studying the pics of your machine with the WF on and those of mine and I can see that your foot seems to be sitting about 1/8 inch back from the needle than mine. Also if you look carefully at the pics you can see that the little piece that sticks out for the thing that comes down to latch the foot is at the very tip, but not within the latch in your pic and definitely within it in mine. I wander if something fell in the hole for the cone and is keeping it from setting in right. Did you take the WF off when you changed your needle? If so, somehow it went on goofy. Not sure how to fix it, but try taking it off again and putting it on by tilting and twisting as the others suggested. Who knows, it may just work this time. Other wise, hopefully your dealer can help.