So I am supposed to screw the bottom cap onto the middle extension and make it into a short single 18350 sized mod correct??? Mine will not screw in. Could it be that the threading on the bottom cap is messed up? if so why would it still work on the second extension tube and be able to be used in the 18650 bat size???
That same thing happened to me, the bottom cam can screw on tube extension but not on main unit for 1x 18350 setup ,, i just grab the screw cap with a towel ond screw on applying pressure and wobling a bit, until i get it to screw on,, then i unscrew and screw a couple of time and now is working more smoothly,, seems like the threads on this device arevery rough,,
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