Earth strap

[Eminent]

Hello.
In this closed topic i read that there is an earth strap connected to the PSP.
I have an earth strap connected under the bolt where the PSP oil reservoir is fixed to the head.
So now i assume this is work from the PO as he might not know where it belongs.
My question, where should it be connected at the PSP?
There is a hole with thread which is not used at top of the PSP.