wotiyo can you make a 3.5mm male to female jack for iPhone?
(I think it's a 3.5mm, but it's longer, probably because it accomodates for the mic as well).

I actually bought quite a number of these from http://forum.lowyat.net/index.php?showtopic=592156
It works perfectly fine with my Sennheiser canal phones. But when I plug my Grado in, the cable is very heavy and is yanking the male-to-female connector.

I'm afraid that the connector may actually break, so I'm wondering if you can make something more durable? How much would you charge for it?

Note: Your work looks good.