Pin converters have been around for a while, but new designs such as Bettina's and Lorenzo Mele's vertical adapter (above left) and Sean Brown's (above right) are so refreshing.
In 2012, I did a post on using a straw as a pin converter (click HERE). Something quick and easy. For something stronger than a straw, you can use various sizes of brass tubing in whatever size that would accommodate your cable or chain. Just slip it over the pin, close, lock and slide it on a chain.