Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Should the screw on the top of the ballhead (going into the camera) be stationary? Mine spins around and won't tighten.
Document: The ballhead came with an adapter-like screw that made the ballhead to rotate around the tripod. That made taking photos a bad experience because it caused the camera to rotate as well. After removing the adapter-like screw the ballhead attaches tightly to the tripod, so it works OK now.
Best of all, it looks like it belongs on the gorillapod by design -- you wouldn't even know it's a separate head.Don't just get this if you have a Gorillapod, get this if you're looking for a good quality ballhead that you can screw onto anything (even DIY projects! )I use mine with a Sony Alpha SLT-A77, and 16-50 f2.8
I lost the attachment piece to my pod and decided to try this instead of the standard attachment and so far it is handy, does offer a little more flexibility in camera angle. Easy to attach and remove from the camera, only con is that the screw does require a coin or something to really tighten but I have used and hand tightened without one but for some who want the extra security keep a coin handy.
I use this regularly with the Joby GP3 Zoom Gorillapod. It is an excellent combo when you are on the go: lightweight, adaptable, and practical. The top part screws onto your camera (just use a small coin) and latches on and off the camera using a quick press of a button.Note that you don't need to use this ballhead on an SLR camera. I use it both with my point & shoot as well as my SLR.
Does the job exactly as advertised. It is well made using seemingly top grade materials. The locking knobs are smooth and tighten well. The leveling bubble is a great feature.
This ballhead is definitely a MUST if you already have the Joby Gorillapod SLR-Zoom. It allows you to have much more flexibility with the angles of the shots when attached to things like tree branches. However, if you are getting this ballhead for another tripod, it is still decent, but it isn't suitable for panning. Also, the attach plate is a little trickier to install than other plates that I have played around with before.
I absolutely love this mount, however I am now on my third one. The pushbutton assembly to release your camera will break on you when it is most inconvenient. The company does stand behind their unit for one year and will replace it, once. But since you have to send proof of purchase within a year, the second replacement was on me. If you are going to be really using this unit, purchase a spare at about 8 months just to be safe.
I use this with my Pentax K-X and I have to say it does it's job pretty well. I like that the camera mount is so small that I can leave it on all the time and barely notice it's there. It seems to tighten down well enough to be sturdy; I've set it at odd angles and never had any slippage. I wouldn't recommend this with a heavy camera or a large lens of course.
I got the SLR-Zoom Gorillapod as a gift, and it was great, but it was really tough (nigh impossible) to aim the camera properly, especially if you attach the gorillapod to a vertical pole or something.The head is surprisingly high quality for its price. It's pretty much an all-metal construction, and the knob is really solid. When you give it a good tighten, it locks the head in place rather impressively.
This thing doesn't work. The base screw female socket connecting the male of the tripod is too shallow and it couldn't even securely fasten on to  the male screw of the tripod. My camera almost fell to the floor while using it. I say this is a bad design - complete waste of money. Don't buy it.
Answer: There is a removable plate on the top of the ball head (remove by pressing the side button).  This plate should mount on any standard camera with the screw that extends through the mounting plate.  Once mounted to the camera, the camera will slide and lock into position on top of the ball head.  If the screw does not fit into the camera, either the camera is defective/non-standard or the mounting plate could have some sort of thread defect.  I had no such issues with my purchase.