How do I replace the spool brake pressure thumbnut on my Spoolmatic gun?
Turn off welding power source and disconnect input power. After cutting wire off contact tube, retract wire onto spool securely then loosen thumbnut to adjust braking. Tighten as necessary. Reinstall components once adjusted properly (See Section 3-9, Page 7).
From the official Miller Spoolmatic 30a manual, page 7
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