Customized version of http://www.thingiverse.com/thing:767317

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=767317

Using the following options:

min_d = 25
$fs = 1
$fa = 1
bearing_h = 7
bearing_d = 22
rod_d = 8.1
max_d = 75
cone_h = 30