here are some pics im not good at explaining this lol the black one is just pcv pipe for plumbing from home depots or hardware store cost very little hubby says about 50 cents or less the other is from a fabric softner bottle i just save the different caps large and small. different colors.
i just silicone the top but leave the space for the cable to fit in , same with the top you can use which ever end depending on the size of doll. the head will still move with the cable. hope this makes sense but it sure it a lot cheaper also recycles a little which i guess cant hurt. 
marlene