They look kind of like cotter ring or split cotter ring that is sometimes used in sailing in place of a cotter pin to secure rigging since they are more reusable than pins that have to be bent. Not really sure though, how were they used?
We use what looks like the same thing to retain all the...
Not so hard with a 2 foot lever when you weigh over 300lbs. Even if you don't it's not so hard when working on suspension bolts you can't get an impact on when you have a frame to lean against.
That's where I think I use mine the most, even when I can get my big battery powered impact on...