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9. How to remove and attach the upper shaft
Preparation: Remove the needle threading system unit and needle bar unit.
1. Remove the 4 screws and remove the handle.
2. Loosen 2 set screws of needle bar driving crank shaft.
3. Remove the Needle bar main driving arm.
（Can be easily removed using a magnet.）
4. Remove the needle bar driving arm collar set screw.
13
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