Bone/armature mirror option isn't working I'm practicing rigging a model and tried to enable the axis mirror in the options menu on the left side of the screen in the tab but it's not working. I recently updated to the latest version of blender and I haven't used this option before.

Does anyone know what could be stopping the axis mirror from working? Also using screenshot to help explain would be a huge help since I'm a visual learner :)

Also due to copyright reasons I can't upload the model, sorry.
I found an alternate solution to mirror bones :)


Select the bones you want to duplicate. 
Duplicate the bones(shift D).
Press S for scale. 
Press X for axis. 
Type -1 to flip it. 
Press Enter and violá! Mirrored armature/bones :)