Hi, I'm more or less an amateur photographer so I don't know all the terms for parts yet but I need advice on a tripod part. I got a good deal on a 6' telescopic tripod ($1.50 at a thrift store), but the only problem is the top part (the head?) is just a blunt plastic circle approximately 3/4" wide. Too wide to actually use on any camera equipment that I know of. So I'm guessing that it's missing the real head, but I've searched online and have only found tripod heads that screw onto another normal, small screw. Nothing that would fit the large fixture this one has. What kind of part should I be looking for?

Thank you.