Still kind of a modding newbie, is the center pin of an 801 DC Jack (radio shack 801 connector) the positive and the outside casing the negative?
Edit: could I put in a ti 5volt regulator. Will this still hold up?
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Center pin is the positive and the casing is the negative but in all reality, it doesn't matter. An atomizer has no polarity. If you are using a metal case or planning to use a metal atomizer feed tube, then it may matter but not for a plastic box in this case.
You don't want to use a 5 volt regulator if you do not have more than 5 volts or more to start with as an input voltage. If you are using NiMhs, you will only have 4.8 total. Akalines are not worth the hassle of using a regulator since they will drain even faster with a regulator.
If you don't have more than 5 volts input, the regulator will ask for more current from the batteries and end up eating them faster. I'm not sure what you want to use a regulator for. You should not need one for the Puck mod unless you are planning on using lithium batteries or such. What's the application you are trying for?