Customized version of https://www.thingiverse.com/thing:2008924

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=2008924

Using the following options:

gopro_primary = double
gopro_secondary_what = double
gopro_secondary_rotated = 0
gopro_ext_len = 115
gopro_ext_th = 5
gopro_captive_rod_id = 3.8
gopro_captive_rod_angle = 45
gopro_rod_nut_th = 3.6
gopro_rod_nut_od = 8.05
gopro_captive_protruding_h = 0.5
gopro_bar_rod_d = 31
gopro_bar_th = 3.2
gopro_bar_gap = 2.4
gopro_bar_screw_d = 3
gopro_bar_screw_head_d = 6.2
gopro_bar_screw_nut_d = 6.01
gopro_bar_screw_shoulder_th = 4.5