Customized version of http://www.thingiverse.com/thing:420386

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=420386

Using the following options:

outer_diameter = 18
point_size = 5
extra_feature = scollops
inner_diameter = 14
clearance_height = 8
top_chamfer = 1.5
no_sides = 50
with_pointer = no
number_of_features = 3
plunge_depth = 3
point_angle = 90
D_width = 4.7
wall_thickness = 3
height = 20
shaft_diameter = 6.1
offset_angle = -30
shaft_length = 11