Have you tried hammer springs and the valve spring too, both these are really what your trying to balance, I found with greater valve spring pressure, stock porting and no port screw along with a softer hammer spring gave me better shot count and a nice curve, that said Ive been fitting Lane regs to...

Agreed
Ive started to use Julian for all my AA spares and he is very helpful and parts arrive on time, and theres the nice little forum discount too

Regards

Chris

I had a unmolested hw97.22 that spat out AAF no more than 3fps difference over 10 shots
In fact Ive been told springers are normally more consistant than pcps

Longshot wrote:Hi just got another s410 & ordered a reg ( alteros ) so interested in this topic / thread & its results .

Please let us know results, as I couldnt get an Alatros to work in one of mine

Sorry pics uploaded weird Nick
If you pm me your email Ill send stuff over

Im no pcp expert but once their apart, there really is nothing to be worried about

Once reg is fitted into cylinder, (10mins) then its just adjusting things

And here it is with a Lancet reg fitted, this is my 1st string so a touch of tweaking will get done

Heres my s400.22 classic

Sounds like the firing valve if by cocking it the leak stops as you are actually adding a touch more pressure to valve seal by taking hammer spring pressure away If its pre AT its a fairly simple job, if its AT its a bummer as you have to drill those to remove, not drastic but be carefull thats all....

I removed adjuster as I thought Id make the other parts work better, Im no expert and someone might chip in with their findings, but I found less pot lenth helped lower power, make more shots and better consistancy. But chasing things I went past these and found things soon get messy Its a balancing...

The original hammers are 45g
I turned it down and down and down to see what weight worked best with my settings and 40g was bang on, then bought another from Julian, the lighter one I kept for a planned diy reg attempt