If nobody comes thru, contact Bighorn. They swapped mine out for me. I just told them that I didn’t like the particular knob that came with my action and could I exchange it for the other one they offered. They said no problem and by the way, what is your action number. I told them and they said, you have a welded bolt handle. Send the whole bolt and we’ll send you a one piece machined bolt with the knob you want installed. Best action and service a customer could ask for.