What a disappointment! The design concept is good but the execution of the design throws away the best bits: The fit of the parts where the grinding takes place is so bad that it is impossible to achieve a symetrically ground drill. The result is that the hole the drill makes starts off with three or five sides and then cuts oversize until buried at least its diameter in depth. A carefully sharpened 5mm drill made a three-sided hole measuring 5.58mm across. Unable to attach photos.
Have saved money already by being able to sharpen all our circular saw blades ourselves
Very happy now l have worked out how to use it. Instructions not very good
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