Don't know if this technique is new or not.... Was going to set the octagon barrel up in the four jaw chuck to bore for the tap. I tried a different approach. Took a salvaged bronze sleeve from a valve. Bored it so that it was a tight slide fit on the barrel. Split the sleeve lengthwise, ran the barrel through, and grabbed it in the three jaw chuck. Automatically centred the barrel, no fooling around with the four jaw. Bored for the tap, and started the tap in the lathe.


















































