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Check the main post I put it there as soon as it came out.Marked and will see on computer back home. Recently I have found Ma Long made a series of videos in cooperation with DHS of generally all his techniques and experience in details with live modeling and explanation by himself, aimed to guide amateurs. Not only Ma Long, but I have also seen such tutorials by at least Wang LQ and Wang Hao (may be even more). Explained by world champains themselves, I think these vids can be valuable. You can find them on YouTube by searching using the player' Chinese names such as "马龙乒乓球教学". However, it is a shame that they are in Chinese and I have not yet found an English subtitle. I'm using mobile and will give you a link when back from work.
...i notice that ma long is playing with a ball which has markings like a small football. does that help? to see the ball better and develop a better more consistant stroke?