Lots of useful stuff appearing on here, in answer to one post I will try and add photos of some of the trigger parts that are in the Omega I am trying to sort out.
The trigger has indeed been modified in that a tiny coil spring has been fitted into it, this is at the point where the front end of the lower leg of the rear sear ''touches'' the trigger. The trigger spring proper was so badly bent it just ''floated about'' and did nothing; the trigger adjusting screw has been cut so that it doesn't project beyond the trigger surface [no photo of that]. this means that a ''two stage trigger'' has been created; in that the trigger moves against the little springs pressure until it becomes squashed and the trigger then touches the rear sear's front edge; the upshot of this is a monumental change of leverage and it takes no feel-able pressure to discharge the gun; in fact it will self discharge on closing the barrel, or at random before that!!!I have now fitted a new trigger spring and a longer trigger adjusting screw, this now gives a longer '' one stage '' drag type trigger action with variation by adjusting the screw in the trigger.
However the trigger is still extremely light and I now have a new rear sear on order, hoping it will resolve things. I think that the overlap portion on the rear sear has been reduced to give a lighter let off, as the front to rear sears overlap is almost non existent; I have now had this trigger apart so many times I can almost strip and re assemble in my sleep so any advice I have I am only to glad to pass on if anyone asks.
Please have a look at the photos and let everyone know your thoughts.
abellringer

https://i.imgur.com/j18TaQu.jpg
https://i.imgur.com/iPaGTmG.jpg
https://i.imgur.com/GwEAJ6L.jpg
https://i.imgur.com/qkWK2F1.jpg
https://i.imgur.com/TfhgiBW.jpg
https://i.imgur.com/yeJvBCb.jpg
https://i.imgur.com/DKF7zHu.jpg