How to refill lexmark color 27 cartridge?

I have refilled lexmark 27 carts. There are no holes. You have to make them yourself. If you buy a refilled cartridge, you will see where they belong. I finally gave up doing it, too messy and did not last long.|||I have no idea, go to lexmark.com, maybe you can find out.|||when you buy a refill kit it has all the instructions with it it is quiet simple but can be messy if not careful|||im not sure, but do u have the manuel, well look for holes