Howdy Pnguin,
Parts came from Lowes, probably get them almost anywhere. I'm not at home for a few days, so this is from memory, it's a 1"x3/4"x3/4". Since it is a copper connector, the diameter is an inside diameter and even then is a bit larger than stated. You have to look real close to see it, but there is a 1" diameter straight connector attached to the bottom to give it the length it needed. Just prepped the ends, use a clamp to hold the two pieces together, used some flux, heated with a torch, and tapped on silver solider. After everything cooled, did the same thing again to overfill the connection, and then sanded till it was flat. Up close it has a fine silver line running on the outside..
I also shortened the two smaller connections since it didn't need them as long as they were when stock. Could have probably cut them a bit more if I wanted too. Also cut down the large connector I added to about 1/4" longer than the battery pack. Now, on the battery pack, it slides in and stops, just before the small T connector location. Inside the large portion of the pipe, where the T comes off it, there is a ring from the factory where the 3/4" tube is attached. In all reality, that ring could be grinded down enough to slide the battery box in further, making the overall tube length shorter. Would cramp stuff up a bit, but it is very possible to make the whole thing smaller, meaning shorter length wise and not quite as wide by cutting down the button tube.
I used a 510 connector in the top end. I started out with a cast T nut that had a diameter a bit larger than the inside diameter of the top small tube. Ran a bolt into the threads, put it on the drill press, and while running, hit it with a file until it was ground down to a diameter that I had to press in tight. Used the bolt to make sure it was straight up and down. I put it in with the long leg of the T nut pointing down to shorten the height of the 510 connector I was using. If I put it in the other way, then the connector would have been above the height of the tube. My vivi novas and my
tanks all fit down inside the copper tube, gives it a nicer look, IMHO. Then drill out the threads of the T nut to the proper diameter for the 510, used a reaming tool to adjust the size of the hole. Nice tight fit. Using an old carto in the connector to hold it straight, I used JBWeld to fill in the top portion around the T nut and the 510 connector. Used a small J shaped piece of metal like a forming tool to push the JB into all the small holes and any gaps. Once it dried, I did another layer of JB and smoothed it out to give it a more finished look.
The caps are just the chrome push ons. They come on and off with ease, but stay put unless you want to remove them. I did not use the body as the ground. I ran all the wires, both positive and ground. On that battery box....Lowes did not have that type in stock, radio shack did not have it in stock, the local RC place did. On all 8 corners, I used my Dremel and removed just a touch of material so it would slide into the tube. It was just a wee bit too large stock.
Lots of sanding to take out any scratches, and there were plenty as I thought this was only going to be a test, and then decided to use it as is. There would have been less sanding needed if I had been more careful. Save yourself some work and use caution. Got a kit from harbor freight, two different polishing rouges and 2 wheels, was like $4.50. Polished it to a great shine, then use BLUE PARROT car wax on it. That was a waste. Tarnished up in 2-3 days. Neighbor sez he uses a spray lacquer to coat copper at work......decided I was gonna paint the HYDRANT (Mustang gave it that name), and I've got a fire engine red can waiting for my return home, lol.
BTW, the thing works great, lots of clouds of vapor, a good taste, etc, etc. Battery pack last as long as my 18650 does in my lavatube and my VModXL, if not a bit longer.
PUCK, ya did a good thing with your original design, can't thank you enough, and my wife hates ya....I'm working on my projects instead of designing/creating jewelry or doing leather work, HA.
If there's anything that needs a better explanation, or anything I can do, post it here, or PM me, would be glad to help.
I have 4 x 14500 batts (I think that's what they are, they are laying around collecting dust) and looking for an idea for another project using those. I have a very easy way to make a wood box that almost anyone can do with a minimum of tools....I may have to make a box and try that. Also thinking of buying a few of the 4 cell NiMH that looks like a 18650, and will have to try those. Anyone with any ideas how they should be used, speak up!
Big Mac