Disassembly of Pulleys and Spindle Mounting

What happens here

The presenter lowers the mower deck and places a blade back on to stabilize the spindle. He then uses the impact driver to loosen the nuts holding the pulley from the top side. He explains the pulley has a keyway and a 'goop' to keep it in place. He then proceeds to fully remove the mounting bolts for the spindle from the underside of the deck.

Goal: Remove the pulley and unbolt the broken spindle from the deck