Threaded neck and cap. I think I'd start with wrapping some half round wire around a suitable sized mandrel. Let's say 1" tall. I'm going to do this on a press. Using the concept that when I smash a piece of rubber It gets thin under the press, that material moves to the side. It takes the vertical pressure and makes the pressure go horizontal. You will need two silver cylinders that telescope each other and will both fit over your mandrel. seamless is best. Neoprene instead of rubber. I'll have to make a tube of it about 1" thicker than the cylinders. put a release agent between the telescoping, soon to be parts. could be plastic wrap. insert the mandrel. put the cylinder of neoprene over that. put a tight fitting pipe section over the package. use your socket set to find a cylinder that fits between the pipe and your hollow about midway. press it. should produce two threaded to each other cylinders. That's the concept. Very doable very quick. Anneal before pressing. hydraulic necking. On your form is just a matter of setup on the press. Brad
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threaded cylinders
Threaded neck and cap. I think I'd start with wrapping some half round wire around a suitable sized mandrel. Let's say 1" tall. I'm going to do this on a press. Using the concept that when I smash a piece of rubber It gets thin under the press, that material moves to the side. It takes the vertical pressure and makes the pressure go horizontal. You will need two silver cylinders that telescope each other and will both fit over your mandrel. seamless is best. Neoprene instead of rubber. I'll have to make a tube of it about 1" thicker than the cylinders. put a release agent between the telescoping, soon to be parts. could be plastic wrap. insert the mandrel. put the cylinder of neoprene over that. put a tight fitting pipe section over the package. use your socket set to find a cylinder that fits between the pipe and your hollow about midway. press it. should produce two threaded to each other cylinders. That's the concept. Very doable very quick. Anneal before pressing. hydraulic necking. On your form is just a matter of setup on the press. Brad