I am currently working on an old 1899 serial #23.6XX that has Aluminum or Pot Metal carrier. The carrier spindle shaft is cast into the spindle head and there is a steel hub cast into the rear of the carrier that is machined to fit into the spindle support inside the receiver.The only thing magnetic is the steel hub that is cast in. The very back of the long fin broke off of mine, looks like that is what was brazed in the earlier photo. Spring adjustment is just a slot in the end of the spindle head.

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