Hello, I have a project in the works that I need some advice on. I am not a 3D designer, I just came up with the concept and had a guy model it for me. Being that I found this guy on fiverr, I cannot tell if he has any professional design experience, and therefore I do not know if the threads he designed will work. Obviously I would like to hire a professional to do this right, but I can't afford that. So, any help I can get will be very much appreciated! Just for clarification, all three pieces when assembled, will be about 1"x1"x1" and will be made of anodized aluminum. I am planning on having this assembly machined and what I need to know is about the threads. As seen in the pictures, the two bottom pieces are going to be threaded into each other with a 1/16" piece of plastic in-between them. The current model you are looking at still needs a few changes so bare with me as I explain the details. The center (red) piece has two male threads on it. On the bottom thread, underneath the lip, Is going to be a 1/16th" solid area. This is where the piece will snug inside the plastic. Because of this, I need the threads to be able to be tighten very tight so they do not come loose. What kind of thread design should I use for this? The top piece is meant to be taken on and off when needed. It still needs to be tight but not as tight as the two bottom pieces. As far as manufacturing goes, I need a cheap but quality machinery that does good anodized aluminum work. I will need at least one prototype, but I am sure you all already know that. Any ballpark figure on how much you think a prototype of this type/size will cost me would be awesome too! I have contacted a few CNC machinists in the US and China but have not received any feedback yet. Thanks for the help in advance!