I use a CAD program called Rhino 3D.
I start by creating a 3D model of the part. I use the 3D model so that I
can combine all of my parts into the finished product and check the finished
product to make sure everything will work together. In reality, you can often
use a 2D CAD program to design your parts. For those of you with
Rhino, here's the
Upper-Mount.3dm file.
Smaller...
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