The OWH needs to be UNDER the metal plate.
See pictures of the post :
Metal slats needs to be straightened.
Do the "virtual MD" trick (no MD inside)
Put the OPU/OWH to the center (>> button)
Unscrew a little (1 or 2mm) to release the OWH (red)
Pass gently the OWH under the metal plate
Re-screw the OWH on OPU
Use scalpel (or fine tool) to twist big metal slats (yellow) to re-adjust the OWH height
Use scalpel to twist the little metal slats to make the head flat against to the disc (orange). HINT : Put a minidisc and make STOP-REC-STOP-REC... to up and down the head and untwist theses wires step by step.
Once the head is flat against the disc when the head is down in recording mode like this :
Then try record few seconds and play what you recorded.
If you break tiny metal wires (orange) = get a new OWH, you failed.