Originally Posted by knothead
Still, as I showed in the picture, I use circular rings to lock the turnbuckle and a straight cotter pin for the clevis.
I've used rings for turnbuckles in the exact manner you show and I think that is their best application. I'll try and source some of those larger sizes. None of my local riggers seem to have much of a selection and most use cotter pins. I actually like rings on turnbuckles because it makes tuning the rig faster and your more likely to make the tweaks to your rig mid season that you know you want/need..
I still don't feel comfortable with them on the clevis pins after that Pearson experience and BTW the pin was the right size for the hole. As I said I suspect a slack rig under downwind loads and too long of a pin were also contributing factors...