I finally got some time to look at the No8 trigger; which had a very poor second stage pull off.
Thanks to Mr Laidlericon for his advice and a copy of the No8 manual.
I stripped out the system completely to remove the setting screw; which was seized in the trigger. Penetrating fluid had not made any real progress, so I had to heat the trigger (gently) with a small blow-torch to release it. It came out easily after it freed off with a bit of heat.
No damage to the screw or slot.
Attachment 71403

With the system stripped down it's easier to understand the function. So I have now got the 1st stage set at 3lbs pull with a nice crisp 2nd stage at 4 1/2lbs. It feels so much better!
Prior to this repair the trigger would need a vague 1/8" extra pull to release.
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