The most common faults I find are a tendancy to early rotate the wrist in the swing, resulting in pulling often, and losing balance.
Chicken winging the down swing which leaves the arm far from the ankle at release.
And, a tendancy to rush the downswing.
That sounds just like me!
I want to put up a Video to see what you guys think of my new push away, but its a little too soon.
I've been pushing away the ball with the left hand to the break point. Left hand at 6:00 with all the ball weight in it. Right hand about 4:30 and just along for the ride. As I push out, I rotate my right hand to the 6:00 position. I almost "snap" my right elbow in place in my extension which puts it way centered in front of my body and I can really feel my straight arm with the pendulum swing in my shoulder socket . My right leg is learning to get out of the way because I am giving the right-away to the swing and letting it hit my leg if my leg is too slow getting out of the way. Also, trying to hit the right hip on my down swing if it is too slow moving out; still have about 6" closer I need to get to my slide ankle to have a good, tight swing.
I am also finding out without as much "mach one" pushing on my down swing, I am throwing 18mph instead of 20mph. This is helping me pratice bowling to the break point instead of blowing by it. As I am learning this, I am finding, on my line up, that I look to the break point then down to my starting board back & forth a few times to notice where at the arrows that line crosses. In my push away to the break point as the ball falls I then let my eyes fall from the break point to the mark at the arrows. That seems to shift my brain into high speed reaction mode instead of thinking mode to pick-up the mark at the arrows while in motion, not giving me time to screw-up my targeting and I seem to be a lot more accurate.
I hope this makes some sense to others trying to get better. Again these are my experiences - not to be taken as gospel to model after. Coach insight always wanted.