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Step 1: Tools
Hobby (wireman) Saw
Clamp or Vise
Step 2: Secure the P Supply
Use clamp or vise to hold p supply in position
Step 3: Break the "weld"
As most power supply are chemically bonded, use saw to remove material about 0.5 to 1 mm on the long sides which does not hv connectors
Step 4: Open It
Use chisel to crack and break remaining bond on the un-saw sides. Use chisel to pry and twist to neatly open it up
Step 5: Opened Case
Done. Isn't it neat?