Self-balancing Spot Welding Pen 

I have replaced the original spot welder pen with this Self-balancing Spot Welding Pen.
Previous review video: • Cheap spot welder Unbo...
Tear Down this spot welder video: • What inside cheap Spot...
Adjustable battery holder: • Making Adjustable Batt...
Disc sander in this video: • DIY 12v DC Fan... Disc...
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Aff links:
Capacitor Spot Welder 0.3mm Portable s.click.aliexp...
Spot welder automatic trigger handle pen: s.click.aliexp...
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