Changing Blades / Knives on a Delta 12" Thickness Planer - Model 22-540

Here's the tool I bought off Amazon: https://www.amazon.com/dp/B0BBG4MDMC?... And replacement blades that I bought didn't need since the factory blades still had a good edge on the reverse side: https://www.amazon.com/dp/B07FBP4FTR?...