If there are already wedges installed inside the buckle of your Dual Extrusion Module, you do not have to replace them with the ones in the replacement kit. Instead, you can use the additional ones as spare parts.
If your buckle is normal, do not add this wedge, otherwise it may cause the buckle to break.
Detach the Dual Extrusion Module from the machine first.
Please watch this video for visual instructions.
Remove the adhesive backing from the wedge.
Insert the wedge into one of the buckles.
Use the tweezers to further adjust the position of the wedge inside the buckle.
The appropriate position is as shown, not too far forward or too far back.