Customized version of http://www.thingiverse.com/thing:1430232

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1430232

Using the following options:

Inside_Diameter = 14
Mounting_Holes_Diameter = 3.2
Number_of_teeth = 24
Block = yes
Nut_Depth = 0
Outside_Diameter = 28
How_Many_Mounting_Holes = 6
Length = 32
Wall_Thickness = 1.5
Nut_size = 5.4