I've got a buddy who has machines something which will allow you to just unscrew the nut that attaches to the sankey coupler and use this adapter to screw into the corny fittings with a thread on them. I can see if has any available right now. Otherwise, I had been using a coupler that attaches hex nut to hex nut. I simply keep my corny fittings with a short 5" line that goes to a hex fitting. Then I can swap things out as i need. I had the same problem where I was cutting and reattaching my line over and over again. This works much better.
Here is the link to the coupler you would need:
http://www.micromatic.com/draft-keg-...g-pid-902.html