Maybe if you post on BenchrestCentral, the "Gunsmith" section, someone can provide the information. My Jewell non-BR trigger adjusts the pull using the screw at the "top/base" of the trigger where it enters the stock. But I am not sure if the BR trigger is the same, or if it is fixed at 2oz. Are you looking for other adjustments as well, or just trigger pull weight?
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