I'm always interested in how and why stuff breaks.
This must be very frustrating, and I don't minimize the pain of this discovery.
Just thinking out loud with my fingers....
It seems the roller still rolled, so maybe this was just a case of contact fatigue? If so, then it may be inevitable, depending on the design? If the contact stress is high enough, all the hardening and materials quality in the world might not be enough to prevent eventual failure??
And I will always jump on the bandwagon suggested by mgarblik. It's not about being made in China, it's about a failure to manage the design and quality, no matter where it's manufactured. Unfortunately, when you source parts from foreign suppliers, it's way to convenient to blame your own failure on your supply chain. IMO, you buy the parts, it's on you to make sure you get what you need.
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