On 24/10/2019 18:10, Tim+ wrote:

Ive never understood why so many of the brass keys in particular have the
socket countersunk (thus reducing the contact area).


Possibly it helps with manufacture in that the cheap brass item doesn't
need extra manufacturing processes.

It probably helps locating the key on the valve especially is there is
any rust or the valve has been slightly mangled with pliers etc.



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