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The water shut off valve knobs for toilets and sinks break, get lost and rust away. The replacement knobs from the hardware store often do not fit the valve, or will not slip over the ridges on the valve shaft due to previous damage from pliers, vice-grips - unwieldy in tight work spaces - and the like
used to turn the valve in the absence of the handle. A universal knob with a threaded hole, perpendicular to the valve shaft, in the female socket of the valve would accommodates a threaded, pointed Allen screw. The tightened Allen screw holds the handle in place.
Water shut off valves and handles
http://www.lowescre..._p_web.jpg?sfvrsn=0
[Sunstone, Feb 04 2013]
Pointed Allen screws
https://encrypted-t...8c5O-QykxzHRjuCKYZA
Pointed allen screws used to bind the water shut off handle to the shaft [Sunstone, Feb 04 2013]
Allen screws bind a mandrel to a shaft
http://www.ganoksin...art/BL-Lathe-31.jpg
The Allen screw tapped into the female portion shut off valve handle would bind the handle to the shaft in the same manner [Sunstone, Feb 04 2013]
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This is known as a “set screw”. |
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I've seen a trend to a 7mm square tap spindle / shaft
recently. Seems to be gaining popularity. |
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