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:

ShaftLength = 0
RingMarkings = 10
HoleDepth = 10
ScrewHoleDiameter = 0
RingWidth = 3
TaperPercentage = 20
CapType = 0
Pointer2 = 0
Pointer1 = 1
HoleDiameter = 6
KnobDiameter = 20
KnobHeight = 20
TimerKnob = 0
ShaftDiameter = 10
NotchedShaft = 1
Knurled = 0
HoleFlatThickness = 6