On the HZL-010, you usually disengage the clutch by pulling the handwheel out toward you. If the needle is moving while you try to wind the bobbin, you haven't pulled the wheel hard enough. Give it a firm tug.
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Why is it so rare?
The HZL-010 is a mechanical marvel from that era. It is a computerized machine. It is a heavy-duty, mechanical workhorse with: On the HZL-010, you usually disengage the clutch