Logitech C905 Grip Mount (not-threaded)

thingiverse

I'm putting off printing until the design is finalized. To get it right, I need a threaded hole drilled into the base that matches my standard 1/4" tripod mount, but I lack the expertise to do so myself. I've been using Google Sketchup since that's all I know how to use, and the grip portion of this model was based on TheRealNecator's design (thing:2464087). However, I'm having trouble getting some parts of the model to render properly - specifically where the outside is white and the inside is gray. Unfortunately, parts of the base still show up as gray even though they should be on the outside. If anyone feels capable of helping me create a threaded hole in this design, please let me know and I'll provide you with any necessary files or details to assist you!