How I fix extreme warp in knives

Step 1: Temper bending
Step 2: Carbide hammer peening
Step 3: Double disc grinding
Step 4: Surface grinding

Why this particular order:
-Temper bending after preheating the blank has the least risk with the most reward in targeting extreme U-shaped warps.
-Carbide hammer peening can crack a blade if done too much or too hard.
-Double disc grinding can only fix warp proportional to how much stock is available to be removed.
-Surface grinding relies on a magnetic chuck that may not even be able to pull the part down fully if extremely warped, and the warp will return once magnetic force is removed. Also it is tedious and slow, making it inefficient for removing large amounts of stock material.

Required tools/equipment for temper bending:
-Two relatively flat bars of steel
-Four C-clamps
-Heat treat oven

Required tools/equipment for peening:
-Carbide hammer (buy from KH Daily or Niroc or make your own)
-Anvil or granite surface plate

Double disc grinding:
Outsource to a local double disc grinder

Surface grinding:
Use a stone wheel surface grinder. I have a Reid 6x18 surface grinder.