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My best friend does quite a bit of business with Chinese manufacturers and his experience is....one month the product from the same source is good, the next month it is total crap...he has to inspect indetail every shipment from any Chinese factory every time.
He's especially had problems with any seal, rubber or flexible plastic elements as they tend to 'cheat' on ingrediants to save in the margins. This shows up in casting and later in wear out.
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