Hello, I'm having trouble coming up with how to make the mold for this part (cylinder for a revolver). Essentially it's a cup shape with a small hole through the bottom. I can't figure out where to have the pour hole. At first I considered this two-part mold, but of course, there's no pour hole. Next, I considered this, but I don't know how to solve for the inevitable void there will be around the top. Vent holes won't work because the void area would be the entire top surface. I don't have a pressure pot, nor access to one so that's out. Here's what I'm working on: All the parts have been smoothed out and molds have been made for almost everything except the cylinder and the barrel, which poses almost the same molding problem.