grip down a bit for a start, and use a short club.
Using the left arm only helps to teach you how to pivot properly. If your pivot stops you can't hit the ball and will bend the wrist.
Also helps you to feel lag.
Start with a short grip and short swings, then work up...like you do with a 2 handed swing. Once you have it happening alternate 1 armed and 2 armed to get feelings to carry over.
Hybrid Mode
