Struggling Info Re Npsi Dryseal Head Plugs?

Two questions, really:

Firstly, I sent my T595 head off for pressure testing...would they have needed to remove the 2 plugs as part of the process?

Second question: I noticed more threads showing on one of the plugs, making me think they’ve been disturbed OR have some kind of seating that’s set at a different height?

SO, anything special I should be doing to make sure these plugs are sealed/torqued/fitted correctly? Clearly they are the gateway between a high-pressure water system and the oil-fed running gear of the head!

What are your thoughts, friends?

 

@alfie hi there, thanks for you comment...no they’re not the dowels, they are threaded plugs of sorts.

thanks @Yorkshireman these are the plugs that link the oil chamber with the water jacket in the head...presumably for flushing, though not sure????
In the photos you can see what I mean by a few more threads showing on one of them, making me think that either one is loose, or they are seated on surfaces of different levels?
Clearly I need to find out the information before reinstalling the head.

 

So I’m still none the wiser re these plugs...despite endless searches I seem unable to find any reference to these two plugs in the triple head!
Firstly, am I correct in thinking that beneath these plugs runs the water of the cooling system? Has anyone taken one out before?
I’m anxious that they may have been removed/reinserted when the head went for pressure testing, possibly incorrectly...I only say this because the threads of the two plugs are showing different heights, and I don’t recall noticing this before?
If I remove them, any advice on refitting them, they’re apparently special threads which fail to seal if under tightened or over tightened.
HELP - I don’t want to refit the head until I understand more about these plugs!

 

Would I be right in thinking, in light of the manuals having nothing to say, that these plugs are rarely, if ever, disturbed?
I am SO hoping there is an engineer or experienced mechanic that has stumbled across these before?