Be careful parking on the shoulder of the road near this cache. There is a fair amount of traffic. It is only a short walk into the location of this cache. Be careful retrieving this one - there is only one correct way of releasing it. It is small and can be easily lost. Carefully return it to its hiding place. Tweezers may be necessary. The hint is in the title.
The top part twists off. Do not pull it apart. Hold the bottom and twist in the middle. It is threaded. Thanks