This week I worked on putting together a new etchells rig for a customer. It is a proctor (Seldon) rig from the UK which we had delivered on an etchells to the worlds in Chicago and then put on a boat from Fleet 12 who was at the worlds and they brought it back. Saved a bit in shipping. We measured the stiffness and I am using the following document to give me ideas on how to put the rig together. Maybe it will help you if you have an etchells. Forgot where I got it originally. Click here to download