Diana 75 trigger - Help!

[Alex70]

I don’t like when people ask for a full explanation of things without even trying a minimum research on the subject…. So believe me, I have done my due diligence trying to find a clear explanation on this on my own but I haven´t been lucky –or have been looking in the wrong places.  There is a diagram from the Pilkington TenP Files, but I find it hard to figure out…. I have read a few postings about screw “A”, “B” and “C”, but I am not quite sure which ones they are referring to…

Can you please help me understand how the Diana 75 trigger works??  I just acquired a fine specimen ; )  that came with a very long first stage, with no predictable break.  I’d like to bring it back to two distinguishable stages -and a clear break of course.
I am attaching a picture of my trigger.  I can see 4 screws, but would really like to understand what each one of them does before attempting any adjustments.

Finally, I read in one of the postings that there are trigger adjustments for which the stock needs to be removed…. Is this true?? (I hope not)

Many thanks!

[Finn]

I don't believe you tried hard enough, Googled Diana 75 manual and seventh result from the top was https://forum.vintageairgunsgallery.com/vintage-diana-resources/diana-milbro-airguns-manuals/

Contains every piece of information possible.

[Alex70]

You know, it never occurred to me to look for the actual manual of the rifle, quite honestly.  All of my searches were related to "trigger" and "adjustment", even "disassembly"..... good thinking.  Lesson learned.
This material is awesome, thank you very much for your help!