There is a picture of an oster clipper in the picture so I assume you are talking about an A5 style blade/clipper. Hold the clipper with the hinge facing you, if the hinge is open, then turn the blade so the blade number is facing up and slide it onto the open hinge, start the clipper and push the blade down to shut it. If the hinge is not open, prize it open with a flat head screwdriver. www.sheaeaseltd.com
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