They can be a bit stubborn when trying to get their way, but are very clever in «teaching YOU» to do what they wish. (miniatureschnauzer.ca)
The buttons are a bit stubborn at first, but it's easy to get them a bit softer after using the case a bit. (androidheadlines.com)
You may have to turn the halves multiple times to get it to coat the entire half (sometimes the avocado halves are a bit stubborn). (californiaavocado.com)