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I have the Griz version. Holy cow those blades are sharp. I'll see if I can find the instruction that came with it. I wouldn't touch that blade with a wet stone. I would use a diamond "stone" and lap it lightly. L

Found a Lee Valley link on the topic here: How to Sharpen a Miter Trimmer Blade? *PIC*

It says don't lap the back. There are a number of links on the site with comments on sharpening from users.

I love having it though. My artist wife popped for it so I could make frames for her. Nothing cuts perfect miters like the Lion type trimmer. You can also cut perfect 90s on it. You trim your frame piece about 3/16th long and trim to final size. Use a stop to make certain the opposite pieces are cut exactly the same length. The Griz comes with a couple of aluminum supports with a movable stop block. Depending on the wood, it cuts a glass smooth surface. Pix attached. The original Lyon model was invented in the late 1800s. Every frame shop has a miter trimmer. When I first got it, I just grabbed it to lift it out of the box, and sliced my finger. So mine is mounted on a platform with handles at the balance point so I won't be temped. I also keep a blocking piece in front of the blade for safety.

This is FYI for anyone wondering what the heck it is.
 

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Herb, It is a precision cutter. Exact 45 and 90. I have used it a couple of times to trim the end of a front frame for pocket hole assembly. If the cut is a perfect 90, the frame will be perfectly square. I'd hate to have to make picture frames without it. But be really careful, sharp doesn't adequately describe that blade. Keep the cardboard in it so you aren't tempted to grab it.
 
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