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ASSEMBLING :
1.Srew the chuck on the drill spindle clockwise.	2.Introduce the blocking left screw in a clockwise manner.
NOTE :This blocking left screw is aimed to keep the chuck screwed on the drill pin when rotating leftwards
DISMANTLING :
1.Unscrew the blocking left screw in a clockwise manner.	2. Tighten a 6-sided spanner in the chuck	3. Forcefully tap with a hammer on the 6-sided spanner in an anti-clockwise manner so as to unscrew the chuck of the drill spindle.