Audio-Technica AT-LP120 AT-LP120USB turntable Upgrade Heavy Counterweight AT-CW1 Enables AT-LP120 and AT-LP120 USB turntables to use higher quality headshells and cartridges Low limit: 13g combined weight of headshell, headshell wires, screws and nuts, and cartridge High limit: 18g combined weight of headshell, headshell wires, screws and nuts, and cartridge