Customized version of http://www.thingiverse.com/thing:45117

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=45117

Using the following options:

Knob_Fill = 2
Rosette_Offset = 0
Knob_Diameter = 23
Knob_Type = 1
Number_of_Rosettes = 1
Chamfer_Size = 0
Thread_Size = 9
Wall_Thickness = 0
Rosette_Radius = 0
Knob_Thickness = 6