Use a Phillips screwdriver to remove the 18.5 mm‑long tensioning screw from the bracket towards the back of the left side of the Cricut

Screw the nut away from the head of the screw by a few full turns.

Screw the screw into the hole in the bracket until the nut makes contact with the bracket.

Use a 6 mm wrench to hold the nut and screw in the screw until the belt reaches the correct tension.