Help! Club Feels like its constantly turning in swing

My club feels like its constantly flipping around in my swing. What I mean is that it feels like its flipping open all of the sudden at the top and then I never know where its going to end up in the downswing. Why is this happening. I don't THINK I'm pronating my left arm. I just don't understand it....it feels sloppy as hell and I have no guess as to where its going to go. What are the reasons for this?

My grip is pretty good. Always has been. I guess I don't fully understand the role of the right arm and elbow in the takeaway. I understand it for the one plane swinger (up and behind) but what about the two plane swinger. If i feel like the right elbow just hinges straight up to keep my arms in front of my chest, on the downswing i come over the top and am extremely wild, never making pure contact. Any advice?

Strong and weak grip explained.

A strong grip is called such because of the tendency of strong people to grip the club that way especially at the top of the backswing. Weak grip is called such because of the tendency of weak people to grip the club that way especially at the top of the backswing.

Pronation/supination, dorsiflexion/palmarflexion.
Anatomical terms of motion - Wikipedia, the free encyclopedia

A strong grip is the combination of pronation and dorsiflexion of the left hand for a right handed player.
A weak grip is the combination of supination and palmarflexion of the left hand for a right handed player.

You may not pronate the left hand but if you dorsiflex it, you will open the clubface anyway. Dorsiflexion is one way to hinge the wrist further because the club has the tendency to fall lower at the top. So if your goal is more wrist hinge and your solution is dorsiflexion, the result is actually a narrower swing arc and an open clubface.

Try this:

Long left thumb: (edit: loose long swing)

Club drops lower at the top of the backswing
Swing arc is narrower
Distance traveled by clubhead is shorter
Angle between left arm and club is narrower
Thus, movement between top-of-the-backswing and impact is longer
Acceleration is more violent and more difficult to control

Short left thumb: (edit: tight wide swing)

Club drops higher at the top of the backswing
Swing arc is wider
Distance traveled by clubhead is longer
Angle between left arm and club is wider
Thus, movement between top-of-backswing and impact is shorter
Acceleration is smoother and easier to control


Also look at the flat left wrist, Greg's right hand drill, and check the size of your grips: they may be too small for you to grip them properly.