As with most conventional tonearm & headshell combinations, the best we can hope for is to perfectly align the null points according to the alignment gauge we are using. So at these point our cartridge is tracking perfectly with the grooves but the rest of the record playing area is basically a compromise getting close as possible as we can. The Nasotec Swing Headshell correct this problem by gently moving with the grooves, creating perfect alignment. Features of the new spring version] - Two springs hold swing head: more dynimic and more firm bass - Perfect swing balancing: better tracking ability - Easy to set up [ Specs ] - Gross weight: 12g - Swing head weight: 4.5g - CNC machined aluminum