Customized version of http://www.thingiverse.com/thing:45877

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=45877

Using the following options:

shaft_h = 14
shaft_r = 10
base_h = 16
base_res = 10
min_r = 20
dt = 0.01
shaft_res = 40
fillet_r = 8
key_th = 0.25
shaft_in_r = 5.5
BIG = 50
key_wid = 1
shaft_in_min_wid = 15.5
max_r = 18