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How much does it weigh, and how do you hold it?
If you hold the end of the handle, your are swinging it using wrist and lower arm muscles, which will tire you quickly.
I've also noticed that many...

I will post pics later today. Just wanted to say that it is important that the flat bit is not actually flat or even 'nearly' flat.
Of course it depends of your definition of 'nearly'. :)

If you...