Hello, Is anyone familiar with the type of mounting screw(bolt) that is non removable. I am not talking about a bolt that can not be unscrewed. For example: Imagine some kind of a lid that needs to be screwed on a box. The lid would have some kind of pre installed screw that cannot be removed from the lid, however it can be screwed/unscrewed to the box at will. I have seen those types of screws in computer cases for example, but I do not know the mechanism that holds the screw in place. What I am looking for is the type of those screws, or the mechanism to implement this feature. I have been searching all around the net without any success. Any help is greatly appreciated.
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