need help tethering my Touch to my Mac

[psywzrd]

I tried searching here and didn't find much info so I'm hoping someone can help me out with this. I have Phone as Modem on my Sprint plan and I'm trying to tether my Touch via USB on my Mac running Leopard. I have Missing Sync installed and I'm able to sync my Touch to my Mac via USB without a problem; however, I can't seem to get the tethering aspect working.

When I connect my Touch to the Mac and go to Internet Sharing on my Touch, I'm assuming I'm supposed to choose the Phone as Modem network connection and hit "Connect". Once I do that the status on that page changes from "Disconnected" to "Check USB cable connection" and I am unable to connect to the internet. Is there some type of configuration change I need to make on my Mac in order to get this working? It seems like I'm so close but I can't figure out why it won't work. Thanks.