Here are the steps for upgrading your dual extruder from J-Head hotends to All Metal E3D hotend. You will also have to update your firmware after this installation is complete as the max temperature has changed along with settings for the thermistor. The offsets have also slightly changed with the dual E3D setup.
After everything is installed, you are going to have to update your printers firmware. Instructions for this can be found in the resources tab of the forum. You can also find a YouTube video on updating the firmware here.
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