Customized version of http://www.thingiverse.com/thing:91035

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=91035

Works better than I had expected. Holds firmly using casual M3 bolts.

Using the following options:

Handle_Length = 65
Set_Screw_Diameter = 3
Set_Screw_Nut_Thickness = 3
Drill_Bit_Diameter = 4
Set_Screw_Nut_Diameter = 5.5
Handle_Diameter = 15
Number_of_Nut_Traps = 2
Resolution = 25
Drill_Bit_Diameter_Units = 1
Drill_Bit_Length = 20