I tried this today for my SE215's, the foam plugs I had on hand are too small for my canals. I had an idea while I was messing with them, I took the shure flex tips and turned them inside out. I cut the smaller rounded side of the ear plug and put a small phillips screwdriver to make the hole. I then put the inside out flex tips onto the screw driver and worked the foam onto the stem. This took a few tries to get it on there. I pushed the foam all the way down and waited for it to expand, then simply flipped the tips back over the right way and voila! I like that the flex tips are now stiffer due to the soft foam filling and I get better isolation to boot! I will take and post pictures when I figure out what the kids did with the camera.
Edit 2: I tried this with my sony hybrids this morning, I ripped the first one and will return to this when I acquire a punch, some of the foam needs to be removed out of the middle as it will only stretch so far.
I found a retractable pen with a sharp enough tip to punch through the foam. Much better and easier, I move the foam to the pen slide the sony hybrid onto the pen and work the punched foam onto it. Easy peasy! I am happy with the result, I am using bits that I had left over so its not uniform. I will try them out on my next break.
The earplug foam is much stiffer then the ER4 foam and will probably provide better isolation. I want to do some head to head with some non-moded hybrids.
I also found a wayward ER4 foam tip and "de-cored" it. The whole thing did fit in a large sony hybrid, although it looked like the hybrid was going to burst, so now I am going to cut the foam tip in half and try them in the larges.
The ER4 decored foam:
FYI The earplugs I used are the Hearos Ultimate Soft ear plugs, their blue extreme protection ones you can get free samples of from their website are quite a bit bigger. I will stop by the store on my home and see if I can find a few different sizes to play around with.
Blue is extreme protection and beige is the ultra soft
Edited by dziendobry - 5/19/11 at 1:47pm