In Reply to: Rusty Grader Blade posted by Onerook on May 14, 2016 at 14:13:18:
A penetrating oil like Liquid Wrench or Kroil (or others) and lot's of patience. Hit it with the oil and give it a day. Hit it again the next day and rap on it with a wrench and give it day. Try to work it the next day and hit it again with the penetrating oil. Repeat until it frees up.