Removing stuck pedals: shimano double-sided SPD | CycleChat Cycling Forum
Amazon.com : CyclingDeal Adapters Cages or Cleats Removal Tool - Compatible with Shimano SPD-SL Pedals and Venzo Brand Spin Bike Pedals - NOT Designed for Peloton Pedals - NOT for Look Pedals :
8 Steps to Loosen Stuck or Stripped SPD Cleat Hex Bolts - Mechanical Monday