A machine I have seen used for maintaining the sharpness of rotary blades is the Rotamaster from Bernhards of Rugby. It is self-contained so won't take up any bench space. Mounting the blade is quick and easy thanks to the clamp mechanism and fast aligning jib bars. The Rotamaster is automatic and ensures both ends of the blade are sharpened equally so the blade will be balanced when refitted onto the mower.
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