I'm assuming the non-stiff adhesive felt is not as prone to this issue, yes?

BTW, trying to cut that felt was a real PITA. Even with a fresh x-acto knife, it would mostly just cut the paper backing and slide the felt around, even though I'd still be cleanly cutting the board underneath it all. My results are not the, uh, cleanest looking, but it works well enough. Couple that with my torn-up alpha pads (still trying to decide exactly how I feel about them) and my missing HE-500 grill, and the headphones look like something I put together using parts from an abandoned factory. My jergpads don't look a whole lot better given how the velour overlay is losing it's temporary adhesion to the pleather pads.

It's thinner, and a little harder to cut, as you discovered, and the thicker, stiffer felt should absorb more backwaves.  I used the thinner felt for the cosmetic mod on the outer frame.

I used a pair of short-bladed Fiskar scissors (not cheap, but not just for this project), very sharp, and that made it easy to cut both types with precision.  They're also good at trimming the edges, should the initial cut be too thick or slightly uneven.  It's tough dealing with 4mm-wide pieces!  I never used my X-acto knife.  I did draw a line on the backing, so I rarely needed to trim.

Frankenphones FTW!  ;-)

Just washed my JergulorX pads for the first time.  No chance to use the cans tomorrow, so they should be dry by Tuesday, at which time I'd gladly pay you for a hamburger.

I used a brand new razor blade and I also had the felt slip on me. So I used some sharp scissors instead.

I think I'm going to give this mod another try since Armaegis convinced me to take the grill off my HE-6. Yup, I never tried before today! I might keep the stock grill but just keep the foam and cotton off. Lining the driver with felt and not using the back foam and cotton should even each other out in airiness and congestedness.

A bit off-topic but since you guys are discussing the HE-6 and pads; has anyone else tried HM5 pads with the HE6? I found it lessened the treble edginess, but it seems to do away with the treble sparkle that's characteristic of the HE6. It also widens the soundstage a little bit, probably because of the greater distance from the ears. I was wondering if anyone can offer up a few impressions compared to the mods you're working on at the moment.

Yeah, I like them a lot... Until I put them up against the modded Abyss.