Loctite Springbars?

They're either the little thingies that hold your watchband on or toilet paper holders for mice.
 
I think these are designed to be removed or inserted by just using your fingers and without the need for a special tool. You just pull on that little rod thingy sticking out and it moves the spring inside. You would need special straps with the hole in the back to use these though. Several watch brands (Technimarine,etc.) now offer easily replaceable straps with these type of springs bars installed from the factory and include several sets of straps with their new watches.

Or I could just be dreaming.
 
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