Lol ok I see. You mean to hold the rod itself. I have some soft pliers tips that I use to hold such things pretty firmly without damage. There is very little torque on the threads as there is no need, but there will be thread lock compound in there that may need a little heat to help loosen, so you can turn it with the soft pliers. If it’s really tight you can clamp the rod in a vice with aluminum/soft jaws as well.