Lightspeed ships with 4g weights, but you can't physically put them in the mouse. : r/G502MasterRace
Logitech G502 X Plus Review - IGN
Find your G502 too heavy? Try arranging your weights as pictured. It changes the balance, making the mouse feel lighter. : r/G502MasterRace
Logitech G502 HERO High Performance Gaming Mouse
Logitech G502 HERO Review
Does your G502 feel too heavy? Try placing your weights as shown (now including Lightspeed!), it alters the center of gravity so it feels lighter. : r/G502MasterRace
How to Adjust the Weight of a Logitech G502 Hero - iFixit Repair Guide
Logitech G502 Hero review: Faster, stronger, but it is better? | Rock Paper Shotgun