I just use needle nosed pliers. Many years ago I actually had a pair of pliers which were made for stuff like this. They resembled hog ring pliers a little bit, but I haven't seen them for at least 20 years. One jaw was straight and one was curved and they worked like a champ. You don't need much, though with this trim ring. Oh, and if you get a replacement trim ring it will be chrome plated (not polished stainless) and the chrome plating will pop off when you crimp it. Good luck.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end