My wife has a KitchenAid Professional 600 watt stand mixer.
I started giving her poor performance and making a clunking sound, so
I opened it up.

For such a beefy machine, the transmission housing is plastic! It's
all cracked to hell. And unfortunately, the worm gear is stripped.

I found the parts at Sears: $13 for the housing, but $30 for the gear.
I hate to spend $50 with shipping to get another plastic housing.
Anyone know of a cheaper source?