you can do either
through the top or take top off
if ya take the cap off you can realy
juice it up ie fill base smother the
coils and tops of wicks and you will get quite a few puffs depending on wattage you throw at them
or just drip through the top every now and then
you should not get a dry hit if you pay attention to ya taste and vapor as you can tell as the wicks start to dry its when you dont pay attention you get the dry hit
View attachment 527409 here is a build i did just for kicks and giggles once you get them going they are great at around 80watts i just had to give them a go and and could not get past 160watts it was just to much heat and well the amount of vapor it was so thick you could almost chew it
they were 26/32 claptons 9 wrap 3.5 id 0.75 ohms
thats almost a foot of wire about 280mm
once you get them going if you keep on it they realy hold the heat so you will either need to drop the power or shorter puffs as it just gets silly trying to keep up with them
go for it have fun and enjoy clappys are fun but gunk realy fast good thing about that is they flavor up fast but need cleaning often