When chasing or cleaning the threads of a U bolt a normal die stock simply will not work. if you have hex dies you can use a wrebch or a deepwell socket. But most of my dies are round cutting dies not hex chasing dies.
I made this for my 1" 14TPI 2.187 OD die
Extended die stock-img_20260526_100947-die.jpg
Extended die stock-img_20260526_131456die.jpg