I adjusted the trigger down as far as i could on my 457 varmint, just to the point it wouldnt engage and backed it off slightly and it still too heavy. I too am considering a Yo Dave spring kit as i have a pal in the states that could post it to me. But as for £200 on a Timney.. hmmm I’m already parting with £600 for a stock for it another 200 bills on a trigger and all that bleating about how I’ll never pay a grand for an air rifle again after how little my rim fires cost will be out the window.