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

pictures with final results of my efforts added pg. 9

Hi!
 
I've tried right now with a pair of the foams you kindly sent me, which I had cut in half. I've used my new Sony Hybrids, and the result is amazing. Isolation increased noticeably with my A151, and the only problem so far is that the right tip keeps on sliding out of my ear when using the big tips (the ones with a light-blue core). I'm going to try with the mid-ones (the ones with the green core) when I come back home.
 
I don't have great expectations because the A151 housings act as levers and so far the only way of having them stay on my ears without sliding out is using foamies. Silicone tips slide easily
 
Thanks for the info, it's great!

They look like they'll sound great, I might have to give this a try sometimes for my pfes

I so want to Wax your hairy fingers I love to wax people the screams are like music 

 
Quote:

natashaful said:

I so want to Wax your hairy fingers I love to wax people the screams are like music 

                                                                                                                                                                                                                                                                                                                                                                                                                                             
 

Click to expand...

 

You guys funny
 
Quote:

natashaful said:

I so want to Wax your hairy fingers I love to wax people the screams are like music 

Click to expand...

 
 

Isn't this basically making cheap Shure olive's?

Just wanted to drop a line and say: great thread. I'm now hearing so much more bass from my iem's that I didn't realize was leaking out from a poor seal.

Nifty thread, with directions that are very easy to follow.
 
I attempted to adapt the results onto my Apple IEMs, modding them with blue Hearos. Alas, my ear canals are too wide to take advantage of this hints in this thread. I did discover that the foams were even easier to make when I left them for a half an hour on an awl; when I removed the foams, they fit quite easily onto my IEM.

I use this trick on all of my IEMs. For my odd shaped canals, this tip is awesome!

I was looking to buy a 3pack of comply t400 for around $18 shipped off ebay until I found this thread. Thanks OP, saved me $$$ and I get to have fun executing this mod.

A totally awesome tip and for cheap. I've gotta rush out to get some of these earplugs to experiment on. Thanks again

The ones that work the best for me are the 3M classic E-A-R yellow, I cut them in half and punch a hold through the middle using a retractable ballpoint pen.
 
Quote:

dacmo said:

A totally awesome tip and for cheap. I've gotta rush out to get some of these earplugs to experiment on. Thanks again

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Does anyone know if the A151 are compatible with the Shure olive foam tips?
Or how to make them compatible?
Thanks