This has probably been discussed more then once. But I couldn't directly find an answer that worked for me, so here goes. I'm having the issue that the recommended pup height is hard to get for some reason on my 5420, seems like the spring doesn't allow for it or something and the pups seems to tilt forward when I try to raise them that high. they also overtone a lot and can't get a clean sound out of them. I lowered them to the recommendation of someone on the forum: Neck at 6mm and Bridge at 5mm. Which still didn't feel or sound stable. So I got them at Neck 7 mm and bridge 6.4mm. Now the pups feel stable in their mount and I get the sound that I like. Is this a personal thing or am I way off?