I got a 430l back at the good time, haven’t tuned or shot til now. It was too hard to finish the cocking stroke. I got a Maccari spring that dropped a coil or two, the UK soft, and it fit the guide well. A piston seal, some moly and tar, other secret sauces, it is doing well. It still feels medium power, but is easy to cock, and I’m shooting in before I try for numbers or accuracy. But a little shorter spring made a much easier cocking stroke