Before I begin 3D modeling any part, I like to take the time to fully analyze the exterior construction and overall build of the item. The best way to do this is by looking at the seam lines, feeling around the part and looking for any imperfections.

This is not a terribly big part, but the funky geometry could persuade someone to 3D scan the part for ease in modeling.

I chose to take a traditional approach and use a trusty pair of calipers, protractor and a set of drill bits. Ideally, one would use a radius gauge set and a pin gauge set, but those tools are quite pricey. The drill bits should suffice.