Ok. I read your thread on the New Members forum and it looks like you have the Joye 510 cartomizer - a bit longer than a regular carto and all plastic housing. I took one of these apart - they are different from most cartomizers in that they have the coil sitting right on top of the battery connector - unfortunately the 'path in' from the batt connection end isn't straight through - there are 'tiers' (best I can describe) where there is epoxy or silicon that allow the airflow through, but again, it's not a straight shot through which is really helpful for a condom fill. I have a wetbox that does a bottom fill with a needle from the bottle inside the
mod that sticks up through the battery connection on the
mod and then (on a regular carto) through the batt connection on the carto - well - there's no way to use this carto on the wetbox because of what I found.
That said, the way I fill this Joye 510 carto is how I fill the mega eGo carto - with a needle tip bottle:
RCE3000 Racers Edge 1/2 Oz Bottle W/Needle Tip
That way.. no syringe... and there are two caps from the mouth end of these type of cartomizers. The top cap (like in the picture on cignot for the mega eGo carto) which I remove and then the 'mid cap' which has the two fill holes on the sides. If you remove the midcap there is a center 'sealed' hole - that you have to punch out to fill via the side holes on the mid cap (normally) - but I just keep the midcap off - I know - it isn't the way that is said but it does no harm in filling directly into the center sealed hole - there is just polyfil inside without the 'center hole' that you'll see on other cartos - to where if you fill the center hole you'll likely flood the atty. That isn't the case with this carto though. So... What I do is then replace the top cap and when I need a refill, I just take the needle tip bottle - put the needle through the mouth hole and 'find' the center sealed hole and squeeze. I watch the batt connection for leakage - then stop squeezing and wipe up the excess.
While that is still a 'task' it isn't as much as having to take the top cap off every time and finding the small side holes in the mid cap to fill.
Hope this helps and if you have any questions feel free to PM me on it.
All of that said, I prefer the mega eGo atomizers and large cartridges (or even the 'cone/attys - both from cignot) over the Joye 510 or mega eGo cartomizers. The boge and slb cartos available from other vendors that others on the new member thread mentioned are also good for better refilling. But again, the mega eGo cartridge hold more ejuice than any cartomizer - other than the mega eGo carto....