Generally, when bobbin thread shows on top, it means that there's too much tension on top thread. Yet, before rushing to reduce top thread tension, first check these two issues:
- Check if top thread unwinds and feeds up well. Make sure that the spool doesn't slide off horizontal spool pin. If it falls – it creates too high tread tension by not giving the thread to unwind properly.
- Check that the needle is good, not sticky, and allows the thread to come through it easily. It should have a large enough eye.
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