I'm actually going to put the old knackered spring back in. Both the leather washer set (part: AR20) and spring (part: AR40 ) came via John Knibbs International
http://www.airgunspares.com/store/ca...EY/Webley-Mk3/

BUT: whereas the leather seal has been a great success (i took ages to carefully and lovingly sand and shape, soak, fit, etc)...
...the spring does not seem 'right'. In comparison it feels Harsh, slammy, noisy. And i don't understand why.

Weirder than that: the old spring i took out (29 coils) only measures 220mm, and produces on my combro crono 434-438 fps, @6.3/6.7 ft lbs. This was the reason i decided on replacing it.

BUT: The new spring (which i didn't measure, but which is definitely longer) is only producing 367-371 fps, @4.78/4.90 ft lbs.

I've stripped it out twice (after a few pellets) to check nothing had happened to the washer, and it feels really good and positive compression when you push it in by hand. But something is not right, and realistically only the washer and spring seem likely candidates.

I only want it as a treasured garden plinker, but i'd like to see the old girl performing a little better. I thought perhaps 9.5 would be a realistic target.

How can you put a stronger spring in and get a 'weaker' result. Don't seem natural.

SUGGESTIONS? (I'm trying to think of all the really basic stuff as well so i can check for any literal mistakes i may have made)

Meantime i'm going to do the sensible thing and leave it in the bag while i consult the various orackles available through this board....
....sort of 'airgun ouija'