As a mere strip of a lad I lusted after a Bultaco trials bike, some 35 years later I reckon there is rather a lot of Bultaco talked about springer tuning
Aside from the obvious, degreasing, deburing and sensibly relubing I think that for most folks a good tight spring guide and top hat coupled with a well fitting seal is probably going to deliver for not much time / money 95% of what they seek.
This does however, for those wishing to to find the grail raise the question of what it is precisely which they do seek...
"Twang" seems to come up often but, in the context of a noise which is apparently not desired, I understand that and curing it is somewhat straightforward (see numerous posts ref twang). Is it the noise reduction, is it a smoother feel, is it improved consistency (I trust they weigh the pellets prior the famous chrono strings), is it simply "it's been tuned", is it a psychological feeling of alls well (important too), is it the goal of a faster so called lock time, is it better groups on the target range...
I ask because after some 18 months of intensive experimentation I had to ask myself these questions, now I don't (read cannot here in France with an air gun) hunt but, shoot HFT and FT style targets / courses. My assessments of improvement are not taken from a bench rest or other aid but, from real HFT / FT positions.
It took me a wee while but, accuracy of the gun assumed, the only key things are a very stable sight picture (aka a PCP) so that I can clearly see the pellet in flight and where it strikes and to a lesser degree consistency (mps or in real money fps) maintained without frequent servicing.
I care less if it twangs, boings, farts, cracks or otherwise behaves, if these two criteria are met then the Grail is discovered.
Now I relate to target shooting disciplines but, would have thought that they are equally applicable to the humane hunter!.
I admire the cottage industry that has been built around springer tuning and if it makes the shooters happy then great but, less Bultaco please