This is something I posted on a forum called, "The snap or hit and how to get it." FYI
The most important thing to focus on, when you are trying to get a snap/hit, is the disc. Not your wrist. The stop of the wrist helps the disc rip off your fingers. Pulling through that action is the other part. What you're trying to accomplish is a heavy rip off your fingers. If the disc slips out it's not good. You need a good grip with good traction. It also helps to discover where exactly the disc is ripping from, in your grip. Most of the time it is a finger pad or two that the inside rim wall rips from. If you are having problems with the rip/snap, you need to focus on the part of the rim ripping off your fingers or finger pads. Pine tar may help you to find and create a proper rip. Without this rip, you can't properly time, aim, or power your drive. None of the other things you do to throw a disc are as important as the disc ripping from your grip. You can generate all the power and speed you want, (to go into the disc), but if you don't have the transfer from the grip rip, you lose it all in slip. It all slips away. Right after the wrist stiffens, the disc rips off the fingers. The arm and shoulders pull through this rip until the disc is gone. The arm and shoulders are lead by the open hips. Pulling through the hit is so strong on a drive that the arm continues 180 degrees past the release point. Just like snapping a towel, the wrist stops and the towel snaps. For a drive, the wrist stops and the disc snaps. Have fun.
I should also mention the position the wrist stops at. The wrist does not stop at a straight, (handshaking), position, but rather more open. This open position can be as little as 20 degrees open to more than 45 degrees. The more open the finishing position, the easier it is to get the nose down.
For any questions or comments, you can post a message on my comment wall.