Thanks Jerry for your feedback, means a lot to me.
I noticed that on the G-70 during run shots vibrations are transferred to the post. After talking with a colleague who worked on G-70 and G-70X after upgrade and new G-70X. He says that G-70 and G-70X after upgrade still transfer vibrations, only new G-70X there is no vibrations problem.
That's why I think between buying used Luna Arm for run shots and leaving G-70 without upgrade or do only g-70 upgrade. But I'm not sure if these little mechanical differences you mentioned are causing the vibration problem in G-70 and G-70X after upgrade?