Insert the circuit board in casing, starting from power connector side. Before inserting the opposite board end put the tip grounding ring to the end of board with two prongs to board side below the board.

Keep attention to the small black plastic button heads at the face side of casing. They are prone to jumping around and get lost if not fixed with a sticky tape from outside.

Insert back two tip contact clamps. The clamp with wider bottom is located more inside the board. Both clamps have fixing pins at the opposite end of screw hole that must go in appropriate holes in the board. Screw the pads to the board.

Inspect are the small controller board firmly sit in the place. If board is loose, carefully push it in till it stop.

Put something thin and strong between tip grounding ring and first contact clamp before installing the casing back cover. Like bundled hex bit, thin screwdriver or small nail.

Install the casing cover starting from the power socket side. Before closing it pull inserted bit outwards to make tip grounding ring stand exactly along the socket wall without free space between. Push the cover - it must freely move inwards over the ring. When it happen, pull the helper bit out and push the cover till end to close it.

Put back casing screws. The long screw into a hole with grounding symbol. Both short tip retention screws - to holes around the tip socket.

Insert back the soldering iron tip. Fasten it with retention screws.