Many of the newer black bobbin winder tires of number 15287A are a little larger than the original Singer tires 15287. When replacing an original Singer tire with an aftermarket tire, you sometimes need to adjust the bobbin winder to maintain the proper pressure on the hand wheel to allow free movement without slippage.
If the needle moves with the stop motion clutch disengaged, the contact area between the wheel and the shaft may need cleaned and lubed. Sometimes, a belt that is too tight can cause the same unwanted needle movement.
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