How did the pulley come off the shaft?

What is Key Stock used for in commercial hvac?
https://youtu.be/QaEQ6s97qb8

Key Stock Assortment
https://amzn.to/3RtMT7O

Bandsaw
Milwaukee 2429-21XC M12 Cordless Sub-Compact Bandsaw Kit
https://amzn.to/3Ehb7iG

Bandsaw
Milwaukee 2729-20 M18 FUEL Deep Cut Band Saw Bare Model: 2729-20
https://amzn.to/3e1V6T5

Jaw Puller Tool
Jaw Gear Bearing Puller Removal Tool for Slide Gears, Pulley, and Flywheel
https://amzn.to/3OQTyLs

Hobart 500572 Handler 100 Welder
https://amzn.to/441sJZr

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@HobartWelders @YorkHomeComfort