Great idea, evert.
There will be many sources of mainspring. Many of which you know of and have used to good effect.
To help kick this off:-
Titan Mainsprings - distributed by John Knibbs and available from many airgun shops.
ARC Tuning
Tinbum Tuning
Welsh Willy
Protek Supplies
John Knibbs for many other standard mainsprings
Chambers Airgun Spares for many other standard and replacement mainsprings.
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