Hello....
I think i found a new method a bit dangerous one that might work with the new cartridges relating to the transparency problem...
I tested this on a 521.

As you can see the sponge is visible!!!

Here is the raw ink container.....
I used a screwdriver and a blowtorch....

Uploaded with ImageShack.us
Tips..
You should always clean your screwdriver after you finish each move!!!
If you try then the screwdriver shouldnt be too hot always..
It is better to do the same movement parallel to the cartidge not vertically!
As long as you start to see stop there.. Plastic is a little thin after and can break easilly....
I think i found a new method a bit dangerous one that might work with the new cartridges relating to the transparency problem...
I tested this on a 521.

As you can see the sponge is visible!!!

Here is the raw ink container.....
I used a screwdriver and a blowtorch....

Uploaded with ImageShack.us
Tips..
You should always clean your screwdriver after you finish each move!!!
If you try then the screwdriver shouldnt be too hot always..
It is better to do the same movement parallel to the cartidge not vertically!
As long as you start to see stop there.. Plastic is a little thin after and can break easilly....