http://www.irishtimes.com/newspaper/sport/2012/0324/1224313818427.html
This is a very good article describing scrum mechanics and the front row positions.Following the scrum debacle at Twickenham, former Ireland and Leinster tighthead prop EMMETT BYRNEattempts to demystify the dark arts of the front row, explaining the roles of the loosehead and tighthead props, the mechanics of the scrum and looks at what Ireland could have done to survive in Londonhttp://www.irishtimes.com/newspaper/sport/2012/0324/1224313818427.html