one point to 3 point

[RETTE]

a year or so ago i saw an adapter for a one pt that would allow you to hook to a 3 pt and then use the one point fast hitch. wondering if anyone has a pic of diagram of one of these. the one i saw on ebay looked professional made. ,y father has said that he has seen these type adapters before but cant remember how excatly they were made. i would love to find a pic so that maybe i can make one or better yet one i could buy