12 to 1/4 inch coupler

thingiverse

Here is the thingiverse design with customizable parameters: Created on http://www.thingiverse.com/apps/customizer/run?thing_id=299663 Instructions for Building Custom Model: Using These Options: - pressure_point_thickness: set to 4.5 mm - height: customized at 25 mm - articulation_thickness: configured as 1.5 mm - diameter_bottom: 6.35 mm in diameter - opening_width: a gap of 2 mm is applied - bolt_diameter: threaded rod has a diameter of 3 mm - nut_diameter: internal thread for securing the bolt, with nut having a diameter of 6.25 mm - diameter_top: outer ring width at top end set to 12 mm in diameter - outer_diameter: overall frame outer edge circumference configured to 20 mm in diameter - washer_diameter: rubber seal at the threaded connection has an outside dimension of 5.5 mm