Here's a conversion bolt handle for the Sako TRG series I made. It is threaded for the standard 5/16x24TPI knob and is about the same length as the factory handle with round plastic ball.
Beautiful finish job, Gordo2. Anyone making one with a recessed 1/2" wrench head for removing scope rings? I imagine, and I'm not a machinist, that the wrench head would more readily be converted to a bolt handle rather than the other way around.