The system is used to mount helical blades (3) on the cylinder (1) of a lawn-mower, being initiated by forming helical grooves (2) in the cylinder. Next the blades are housed into the grooves to be secured by an appropriate adhesive, the groove width being nominally equal to blade thickness. - The number of blades on the cylinder may equal the circumference divided by the distance L between blade centres. L equals 1+ b1 + b2 + e where 1 is the blade thickness, b1 and b2 represent the adhesive filled clearance of the order of 0.1mm and e is the clear gap between blades. The adhesive may be of the anaerobide or the cyanoacrylate type.(1/1)
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