Holder here
They can be found cheaper somewhere I assume but for no you may want to go to a shop and ask if they can do it for you and ask if you can watch.
First Stage Vise Handle
First Stage Vise Handle. Designed to be used in conjunction with all diving industry first stages. When this tool is threaded into a HP or LP port, it forms a solid handle that can be clamped in the vise, allowing easy removal/replacement of yoke nuts, p
www.scubatools.com
They can be found cheaper somewhere I assume but for no you may want to go to a shop and ask if they can do it for you and ask if you can watch.