How has the cable held up?

I had to do the same exact thing for my resin iems and gr07c's. For gr07c's, I rubbed iso around the seam and then hit it with a heat gun from far away to soften the adhesive and started prying apart the shell. It came apart and I found out that my driver was dead and the wire had detached...

Have you tried them? How do they sound?

Changing the fuse and getting sonic differences sounds like a bunch of bullcrap to me. A fuse is pretty much just a resistor which doesn't introduce any type of noise into the circuit, just resistance (very low resistance at that). Even if it somehow magically introduced some noise into power...

Wow that is extremely crappy. Good thing is, if you payed with paypal you can file a charge back within 180 days and most likely get your money back.

Crosstalk at such low frequencies will be pretty much non existent. I think that mics aren't included in "audiophile" cables as they are just not needed in such applications.