Customized version of http://www.thingiverse.com/thing:54024

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=54024

Using the following options:

TaperPercentage = 10
HoleDiameter = 6
NotchedShaft = 1
ShaftDiameter = 11.7
Pointer2 = 1
Pointer1 = 1
HoleFlatThickness = 2
ScrewHoleDiameter = 0
ShaftLength = 24
RingMarkings = 1
Knurled = 1
HoleDepth = 20
RingWidth = 0
KnobHeight = 20
KnobDiameter = 28.8
TimerKnob = 0
CapType = 2