WD30EFRX-68AX9N0 head alignment tips?

[NKnusperer]

Hallo,
I successfully swapped a head from one drive to another (same model with same production date) and was able to copy it.
All screw were tightened with 0.42 Nm of force.
While swapping head to the next drive (I need to recover 3 in total) I accidentally ripped of the connector cable from the head
I bought two donor drives on ebay, same model and production date only a feew weeks later then mine and DCM is matching on 5 and 6 position.
However I was not able to get results with any of them, just clicking noise when powering on.
Just beieng curios I put the head backs to the donor drive but with no luck (drives were working before).

Question now is if the first run was just a once in a lifetime random hit to align the head perfectly or is there something else going on?
It is also not clear to me if torque on every screw is important or just the one that anker the head?
When I apply much torque then 0.42 Nm to the head screw then clicking noise is much more silent.

Any tips?

[pcn]

Drive should not have head alignment issues. So heads do not match, heads were damaged when swapped, media damage or damages / problems in SA.

[digisupport]

If donor HSA is not working again in donor, then you or patient killed the HSA.
There are more important parameters then DCM to match HSA - i hope this is your own drives.

Happy new year