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[0] Bearing [1] 1 [2] 1 [4] Steel [5] Durability, Strength and cost. [6] Turning [7] Most cost effective method of production for component. [3] 
Main pivoting and connection point where the blade nut acts through the lower/upper blade guards, saw blade and pinion shaft. It is imperative to the operation of the saw.
Gate 3 - Group 15 - 2012 - GICL Wiki