Most common problem is the mounting tongue snapping shut leaving you nothing to mount the blade on. If the tongue is not sticking out so you can put the blade mounting into it then stick a screwdriver behind it and make it come open. The tongue is a flat piece of metal at the front with 2 lines pressed into it. When it is hanging out pop the blade onto it, turn the motor on and snap the blade shut forcefully.
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Most common problem is the mounting tongue snapping shut leaving you nothing to mount the blade on. If the tongue is not sticking out so you can put the blade mounting into it then stick a screwdriver behind it and make it come open. The tongue is a flat piece of metal at the front with 2 lines pressed into it. When it is hanging out pop the blade onto it, turn the motor on and snap the blade shut forcefully.