You could use the blade, if you need a really sharp edge for delicate work. When you use the razor blade you can break the blade and use one half. If you just wrap one edge in duct tape or put it in a piece of wood there is substantial risk of cutting yourself (done it, learned my lesson). <br>I use disposable scalpell blades instead of razor blades. They are sharp and have a section that can be used as handle. The scalpell blades are also thicker so they are much easier to handle.
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If it isnīt broken, it doesnīt have enough features yet.