Hi Bony,
As I remember it was a discussion about speeding this operation, especially about the security problem, I don't know the working legislation in your country but here in EU if you are not alone to work it's impossible to use a chuck key without security.
The solution with those very usable keys is to put in the center a rod mounted with a spring to expel them when you don't push on it.
I have an old one without spring and it's clearly more practical than the other secured but I've seen a key flying in the workshop too and it's not a good idea for the end of the year to see that again…
Then just an idea for securing a very practical tool.
Have a nice day.
Pierre
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