That drill is outdated, and doesn't work for someone who is trying to develop a pendulum stroke. The bottle drill necessitates an elbow drop.
Scott Lee
www.poolknowledge.com
Scott Lee
www.poolknowledge.com
When I was younger I would lay an empty coke bottle on the table and stroke in and out of it without hitting the edges of the rim of the bottle. I would count how many I could do in a row without hitting the bottle. After a bout 100 or so without touchingthe bottle and going in kind of shallow, I would open up my stroke and go deeper into the bottle and count those. I guess the helps with accuracy more than anything. I learned that from an old timer. It helped my game a lot on accuracy. I would also start slow and eventually speed up to a pretty fast stroke. I'm not an instructor, so take it for what its worth.