Number of nuts depends on configuration. In the pic below I used the bottom nut to snug to the electrical contact (the plug is delrin) and the top one to tension the spring to capture the kanthal. On another one I left off the spring and just used the top nut to hold the kanthal.
In a clearomizer that may not work as well... size would probably be an issue on this config.
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Just curious Teach why are both so long, don't you want one long and one short post for a vertical wick?