Jack A4 User Manual

Mechanical adjustment-Adjustment of Positioning hook
Adjustment of Positioning hook：
The left to right of the
positioning hook is generally
about 0.5-1.0 mm. The gap is
too large, the sound is loud,
the gap is too small, crossed
the line.
Positioning hook

Jack A4 Specifications

General

Brand	Jack
Model	A4
Category	Sewing Machine
Language	English