Repairing a KitchenAid Pro 600

Changing out worn drive gears.
Here is the link to the parts breakdown, part numbers. You can order the parts from this site as well. www.whirlpoolp...
I have heard this link doesn’t work anymore so here is another link where I have got parts from.
www.partselect...
The np4 or np5 serial number uses the same parts.
I used PS11747012 worm gear,
And PS12070620 worm following gear to repair this mixer in the video..