You need gloves for this step. Involves black soft rubber and sharp-edged items

Remove the soft black gel from the paper cone fullrange speaker by hand and remove the paper cone fullrange

Remove the four screws from the thin series woofer and remove the thin series woofer.

Round head and flat tip screws(x4)/ Head diameter：5mm

Thread length & Thread quantity: 9mm & 9

Screw diameter: 3mm