Does anyone know what the thread size of a RICE port is? Or any 3.5mm stereo jack with an exterior mounting nut?

If so, where can I get a relatively flat one to replace the standard one that it comes with that is hex and made of brass or stainless?

Plastic would work too. This one cuts into the skin of your hand.RICE Port.jpgMiddle.jpgBottom.jpgTop.jpg