Mylock 634D overlocker, while sewing it jammed. i have removed the needles and threads. still jammed. the wheel{large knob} on right hand side of machine that lifts the needles up and down is jammed, it wont turn. when press on foot it makes a buzzing noise but wont move. when the large knob is removed the fan will rotate but the needle arm still wont go up and down and the bar that the control knob is joined on to wont turn. is there a way that i can release it my self. thankyou
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