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.
Collection: Rotary Ground Parts
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Sumner 780609 SWIVEL ARM RGC-5
Vendor:Regular price $60.08Regular priceUnit price / per -
Sumner 780607 SWIVEL ARM WLDMT RGC-5
Vendor:Regular price $182.22Regular priceUnit price / per -
Sumner 780606 SWIVEL PIN RGC-9
Vendor:Regular price $38.49Regular priceUnit price / per -
Sumner 780599 WIRE CLAMP RGC-6
Vendor:Regular price $65.18Regular priceUnit price / per -
Sumner 780598 CLAMP RGC-1
Vendor:Regular price $238.04Regular priceUnit price / per -
Sumner 780540 SET SCREW WLDMT.RGC
Vendor:Regular price $41.06Regular priceUnit price / per -
Sumner 775050 BUSH, BZ FL 5/8 X 3/4 X 5/8
Vendor:Regular price $11.09Regular priceUnit price / per