I like the one sold by TC. Nice compact and if you have really screwed up you can always put a wrench on the hex. I have never broken one, lost a few. I have thought of replacing the arm with a longer one but never have. I like it because I can get it on and remove nipples without taking the lock off. Carried one when I was a range officer to help dudes that dryballed.
As noted they are available on the market. With that being said I used a simple pair of needle nose pliers for many years with my Hawken. I just made sure I used a dab of thread grease on it after cleaning so it did not become frozen in place. :flute: