PoolDawg - The Pool Player's Best Friend
PoolDawg - Loyally Serving Pool Players Since 2003.
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The new McDermott jump trainer does not come with an instructional booklet but the company has uploaded an instructional video to Youtube which I've linked here. The video quality could be better but this should give everyone a bit more information on how the jump training ball is used.
I would recommend this product to a friend.