The fact that Brian has a cocking lever without the hole and since the pivot hole and the cocking rod hole are all that is required to orient the part for machining the visible hole when assembled in the action must be for lubrication. I think the part is forged, the 2 shaft holes drilled in a drill jig, the part was then finished on a profiler, and the oil hole could have been added when the shaft holes were drilled or after profiling. I doubt the part required heat treating.
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