How to create two bones move like one?

Hello, i saw in this video (, this rigging:

How to create that? I see two bones move like one bone, please help me, how to create this?

I belive they made a script that rotates the ik hand in the realtime when that staff bottom is rotated so there is no dependency cycle. I can’t think of any other solution then that.

Okay you acctually got me curious so i download spring rig. it appears the upper bone isn’t moving at all its just displayed in a different position with custom shape transform

Thank you.

I tried to create in this method, but I did not succeed.

custom shape transform.blend (625.4 KB)

I’ve made a quick setup for you (2.8 only)

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WOW. Thank you, it’s works!!!