Its been a fun evening, resulting in no joy. The pleasures of mixing metaphors...

Anyway, I watched a couple youtube videos on disassembling martini actions, courtesy postings by gungeek and martini neil.
They made it seem easy and straightforward, which it was.

Knock out split pin, remove screw and knock out cocking indicator.
Disassemble and clean - pieces were very clean to begin with, wiped off excess oil.
Noticed most pieces to be stamped with TD, possibly CD
Even dimantled and re-assembled firing pin part of block.
Reassembly went well, but carbine still goes click, not bang!

Tried rotating lug inside block to give firing pin more snap, but it was not succesful
I was using old brass with a fresh primer. The same piece of brass both times, bence two primer dents.
I notice the dents are off centre, but don't know if its significant