Robin, I haven't touched the air-flow screw in my KFL plus since the day I set it. I've had it set in the fully open position, flush with the base and it has stayed there, period.
Is your grub screw loose in the threads, can you move it side to side? It's the only way I can see it wriggling out.![]()
Everything else is tight. It's not a big deal, I just know to look at it every time I refill.




