[Theodan]

Don't underestimate potential biomechanical issues. Make sure the muscles/tendons in your neck are flexible/stretched enough to stave off being pulled out of position by shoulder rotation.

The only gadget I have seen that may help is the "orange loop' knock off of the Inside Approach. At setup you visually place the ball inside the loop.

Something else is to place a mark on the dominant eye lense of a pair of glasses and keep it over the ball position until both arms through.

The issue with ocular tricks is that you'll learn some scary things about the dominant eye and perceived ball position.

There's little substitute for somebody holding a clump of your hair while you hit balls. My wife seems to enjoy doing it.... there's even a slight look of disappointment when I keep my head still.

Charlie