I thought I'd show you this --- I was given it by a pensioner last year while I was mending his son's JCB in his back garden (secondary developement).
I haven't done anything with it yet, since I half expect the old chap's son to ask for it back when he finds it gone.
I like to think it tells the story of a Father teaching his son to shoot --- and the pair of them building a case for the gun.
I have also found the standard 20mm OD springs too tight in the piston and have used a 19mm OD Meteor spring in one Hawk.
John Knibs now has an even better spring for both the Meteor and Hawk in spring No 11 which is 18.8mm OD and 3mm wire.
All the best Mick