Customized version of http://www.thingiverse.com/thing:55685

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=55685

Using the following options:

RingMarkings = 10
RingWidth = 0
NotchedShaft = 1
RecessInnerRadius = 12
DivotDepth = 0
Pointer2 = 1
Pointer1 = 20
Knurled = 0
DRotate = 45
KnobHeight = 20
RecessOuterRadius = 20
ScrewHoleDiameter = 3
ShaftDiameter = 12
HoleDepth = 20
ShaftLength = 15
KnobDiameter = 60
HoleDiameter = 6.3
RecessDepth = 10
FlatSide = 2
CapType = 0
TimerKnob = 0
TaperPercentage = 0
HoleFlatThickness = 1