Sure thing man,
Step 1) Cut a piece of metal (like coffee can thickness) to roughly the dimensions shown below (length should be about pi*5mm, height is up to you (can experiment: i found longer lengths made the signature sound more artificial)
Step 2)
Roll up the metal rectangle into a cylinder, as such (one for each side, should fit easily but not past the bump) - I used a ~4mm rod to create as circular a shape as possible
Step 3) Obtain a pilot G2 refill (this is roughly the same diameter as the nozzle of the IEM
Step 4) Stretch a sony hybrid or triple comfort eartip of your preferred size around the G2 refill
Step 5) Place the metal cylinder at the end of the ink refill, as such.
Important: Make sure there are no metal edges jutting out of the metal cylinder so it doesn't tear the eartip for step 6
Step 6) Slide position the metal cylinder properly (as centered as possible) and slide the eartip over it. Done! As you can see, the metal ring is now inside of the eartip , holding it open.
I found this mod to be quite effective in aiding the clarity of the audio by, say, 10-20% or so. I find these IEMs overall excellent for musicality, tonality, and timbre. Interestingly enough as well, I don't experience any post-high-volume session ringing in my ears after using these (something that I do experience with the etymotic ER4XRs).
Regarding metal:
I have yet to come across any IEM (either my own, or from reading reviews) that is able to deliver extremely fast, but simultaneously thick and timbre-rich mids and bass. My ER4XRs are faster in the bass department, but they sound relatively thin and boring in the low-mid to bass region. The N3s are slower (DD vs BA), but are more musical and timbre-rich. If I were to rate them:
ER4XR bass speed: 10/10
ER4XR bass musicality: 6.5/10
N3 bass speed: 8.5/10 (could be faster and about 10% less quantity-wise)
N3 bass musicality: 9.5/10
ER4XR: 16.5/20
N3: 18/20
(These scores are just references to these two IEMs, by no means are they absolute compared to other IEMs)