I am trying to find some smaller rings for the dousing points on my spin sail. I have some nylon rings from Layline that work but the knot at the head will pull thru the rings and the sail is stuck. I had thought about putting a plastic washer behind the grommet that wouldn't go thru the ring but am afraid that will tear the sail. I have seen metal rings on some sails but do not know where to get them or if they are stainless or Ti. I leave the rings on so I want to use a material that will not stain the spin. Also weight is an issue on the sail. What are the rings called and where can I shop for them?