hello, just a lttle question, the thing is that i need to change the position of the hand, when spawn it the gazeboarmand_hand.launch.

i found <node name="spawn_hand" pkg="gazebo" type="spawn_model" args="-urdf -param robot_description -z 0.0 -model shadow_model -J ShoulderJSwing 0.78 -J ElbowJSwing 3.0" respawn="false" output="screen" />

and i started changing the value of ElbowJswing, i dit it for example with 0.95 . altough other cases with this values, and i need i kind of podition if like the hand gonna take something of a table.