Well first off, I didn't even think to make a captured ring tool from other tools. I have a whole bunch of allen wrenches in different sizes. How would you make the tool? now the answer to the next question.. I rounded the wood while it is on the lathe, Then marked off the section for the ring with a pencil, then marked the rounded part on the ends of the wood, ( I did not finish that part as the wood got knocked off balance so that part did not get done.) Then I use the parting tool to cut on each side to he marking for the ring. You can make it as wide or as narrow as you want to.. Then I used the spindle gouger tool to narrow the wood down to the ring section and then I used the parting tool several times until I got the depth that I wanted, Then rounded the ring and then went ahead and worked more on the taper on each side of the ring. Then with the skew I started cutting in at the taper next to the ring but cutting inward. Switched between the parting tool and the skew and you have to be very careful because it is hard to get in there with the parting tool. It's a challenge but I should try making my own tool to cut that ring for the heck of it... Fay