Oh my!! That (tight) bass!
To anyone considering this, do it! As above the boomy bass on mine has tightened up significantly, and the highs are more defined too. Well worth it.
I just used the first pair I saw in the office to be fair, your standard, run-of-the-mill scissors. It helped a bit to press the pad on the desk and compress the sponge to make some initial cuts but it wasn't too hard at all.
I modded today. Just pulled the sponges out save the short upper line of the rectangle. The result is just like I love after getting accustomed to armature based iems. Fast and puchy basses and high clarity.The only probable issue is vocals getting closer, almost in my face atm
Lack of sponges did not have a negative effect on the comfort even though I am wearing glasses :)