Righty Tighty; Lefty Loosy

rotate clockwise

show wrench

Lighter

:Darker[ColorData[97][2],0.7] should be a valid color directive, an image, or a list of them.

Lighter

:Darker[ColorData[97][1],0.58] should be a valid color directive, an image, or a list of them.

Lighter

:Darker[ColorData[97][3],0.75] should be a valid color directive, an image, or a list of them.

General

:Further output of Lighter::arg will be suppressed during this calculation.

MapThread

:Object ColorData[97,ColorList]〚{2,1,3,4,5,6,7,8,9,10}〛 at position {2, 2} in MapThread[{Specularity[White,#1],#2,Lighting#3}&,{{3,3,3,6,6,6,6,3,6,6},1,{{{Ambient,Lighter[Darker[ColorData[1][1],0.7],0.05]},{Directional,Darker[ColorData[97][2],0.7],ImageScaled[{0,2,2}]},{1},{Directional,Darker[ColorData[97][2],0.7],ImageScaled[{2,0,2}]}},9}}] has only 0 of required 1 dimensions.

Conventional screws have right-handed threads. To tighten a screw, turn the head or bolt clockwise, moving its top to the right. To loosen, turn counterclockwise, moving the top to the left. The famous physicist Hans Bethe was reputed to remember the convention by relating it to the right-hand rule for vector products:

Some flammable gas couplings use left-handed threads, to prevent dangerous misconnections.