Bart,

I do believe there is only one type of cotter pin. If however you're
going to be doing a lot of tuning on a turnbuckle a "split O" ring is a
better choice. It doesn't deform, tear sails, hook sheets, etc.

Bart, I keep my tension gauge in a cloth bag, with a roll of rigging
tape and assortment of cotter pins. There is nothing easier to install
than a new cotter pin and when its ends are bent over and the turn
buckle taped it is a better set-up

OT