So ya need to give up a little more info so we can help you
will take a shot in the dark
you're using one of these types:
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$14.39 Kayfun Lite Styled Rebuildable Atomizer (4.5mL) - clear tank section at FastTech - Worldwide Free Shipping
and you want to switch out the plastic tank
and install the metal center tank ?
same as filling without site
careful and watchful
you just have to be aware of taste and SOON AS you think you taste slight burnt
add fluid...
simplest to fill, most hold about 4.5ml
so 4ml in a syringe is very nice way to go...