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Under the 'reply' box - where you write your reply - hit the 'go advanced' button. Then 'manage attachments', 'new file', 'upload' and 'insert inline' should get you where you need to be.

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I'm shaving off a Norton 4/8. Shaves are comfortable and close. My only advise would be to lap the stone before you do anything. I lapped mine with some wet 400 grit on the kitchen (faux granite)...