That command (if correct) would have rotated every ItemFrame on the server, give it a custom name. Below I have listed the 2 commands to make it work the way you want:
Try this:
Summon a custom Item Frame with this command:
/summon ItemFrame ~ ~ ~ {id:"ItemFrame",CustomName:"LockFrame"}
Then use the command below to Lock/Unlock the Frame (ie spin it backwards to hide the arrow):
/entitydata @e[name=LockFrame] {Rotation:[180.0f,0.0f]}
.
That command (if correct) would have rotated every ItemFrame on the server, give it a custom name. Below I have listed the 2 commands to make it work the way you want:
Try this:
Summon a custom Item Frame with this command:
/summon ItemFrame ~ ~ ~ {id:"ItemFrame",CustomName:"LockFrame"}
Then use the command below to Lock/Unlock the Frame (ie spin it backwards to hide the arrow):
/entitydata @e[name=LockFrame] {Rotation:[180.0f,0.0f]}
.