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Get one of those REd Devil ones. They are simple, works very well and cheap replacement blades are cheap and easy to get. Trick to any scrapers is to not allow them to flex causing vibration, chatter, or skip, whatever you like to call it, making the cut rough. If you lack a bench grinder, use a belt sander with 80 grit belt. One pass or just rough the belt for 53 seconds will make you want to toss all your files into the yard as far as you can. I have done them both way, milt's way is a bit too rough but it will gouge out any paint especially from an inside corner.
If you don't have a belt sander, get an 80 grit sandpaper. glue it to a board or 4' belt (alum. oxide), wrap that around a block or lumber. sharpen the blade on there. Don't sweat the angle too much but after a couple time, you will find that angle and get the hang of sharping it. Drag that blade along the belt. it will get it nice, flat and sharp or run that belt over the edge of the scraper's blade upside down so you can see what you are cutting into. Works wonders.
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