I could not find a Miller part so I called and was able to locate a hard to find part which they shipped and received in a few days.
Sumner 772800 NUT, INSERT LOCK 12MM
Sumner 772800 NUT, INSERT LOCK 12MM
Sumner Part Number 772800 as indicated in the 783810 - CARRIAGE ASSEMBLY DIAGRAM.
NUT, INSERT LOCK 12MM
Manufacture: Sumner
Regular price
$3.33
Regular price
Sale price
$3.33
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