speaking of machine probs, i was having similar problems w/ mine yesterday.
i ran out of thread & switched to some nylon thread that i had bought a while back not realizing that it was way thicker & heaver than i needed.
it got jammed up so that i was barley able to force the needle up to get the material out.
then i took the racer? out (the ring & other thing that the bobbin sits inside of) & now i can't seem to get the thing back together right???
i gotta find my manual... or look it up on line