Here's a link from a page with some expandable images that can't fail to be of interest to fans of the "semi-nomadic" HPH-200s. It's in French, so I don't know what it says, but it contains the only images I've seen of them taken apart.
After seeing the pictures assuring the pads could be removed, I bought some replacement earpads, to try a leatherette type:
They fit, but though they had the widest holes (inner diameter) of any earpads I saw of this 70mm (outer diameter) size, I still had to stretch them out a bit so that they weren't partially covering the grill on the inside (or whatever it's called that has the little holes where the driver's sound comes out of). I used the cap of a mouthwash bottle, which has a steadily increasing circumference. The pad's inner diameter is now wide enough, but I have to do something about the fact that there's no fabric or foam over the middle. I'm thinking tights or hose, but haven't figured out how to fix the fabric so its taut and not folded or wrinkled. I could have (maybe should have) got these below instead, since they already have the fabric, but they seemed to have a smaller inner diameter, judging form the pictures, which would need stretching out more (both are 70mm in terms of outside diameter):
Anyway, thought I'd share...
Edited by Darner - 2/26/14 at 8:40am