Product review (1 stars): Flawed design, will not last if used daily.
Buyer be aware.  The design of this severely flawed as others have mentioned.  Please don't expect this to last.  My replacement lasted only two and half month (December to February).  We cook often, as in using the knob at least 3-5 times a day.  See my picture for the cracked plastic insert.

Seller refused replacement or refund as its within their rights (outside of 30day return window).  Doesn't justify the unacceptable build quality, again, buyers be aware.