Meccano Ltd. There are other Web Rings devoted to these interests. You just go to the Edit option on the home page, and type in your new address. Or the Ringmaster will do it for you. I am a Meccano dealer. Anybody can join, as long as their site has a Meccano theme.
Commercial sites are welcome.
I want to join, but somebody else looks after my web site, and I can't modify it myself. Your site can't be part of the Ring until you have added the logo and buttons to your site. These are essential to navigate around the Ring. I can possibly modify your home page for you, but you will have to get your webmaster to upload the new page to your server. They are listed in the order of application.