How tightly does that adapter fit into the headphone? That one looks much nicer than the one I have, but the first one I bought looked like that and it kept coming unplugged during normal use

I was inspired by this post and went to my local radioshack to find a 2.5mm cable. They didn't have one, but they did have a 2.5mm to 3.5mm stereo adapter for like 6 dollars, which can be easily sanded down to fit snugly inside the input port with no modification of the headphone! it works fine...