Many Youtube Videos Present Repairing Damage Hard Drives Such As Stuck Heads,Pcb Repairs,Platter transplant Many More.
if something happens to your drive do not open the drive in your room air .it needs laminar air flow workbenchs.Beacause if it is open in room small particles will damage to platters
Precious informations stored on platters ,platters made of polished aluminium or glass and cover with components ferromagnetic layers(actually store data)
DO not Open in Your needs clean Air flow.