E-liquid Bottle cup JAPAN 6ml - Bottom Feeder

HI there, many many users of e-cigarette boxmod bottom feeder, use this king of little sqare bottle for squonk boxmod http://www.japanesekitchen.co.uk/user/products/large/empty-rectangular-bottle-shape-sachets-7ml-x-100pcs-304-p.jpg.
To use original cup, you need to drill a hole to insert silicone tube, most of times is not so easy to make a perfect hole to avoid leaking of e-liquid during squonk action.

Here comes this item which is available in three different types:
- Hole of 4,5mm diame