Gripper Ergo-Jr

Hello,

I am trying to use the clamp with the ergo-jr but I can not find the mesh to obtain a higher accuracy of the inverse kinematics.
I understand urdf files a bit and the main problem is between joints 5 and 6 because it is shorter than the link of the poppy cone and the final link is the gripper and not the cone but i don’t know how to fix it.