OpenSCAD Heat-set Insert Standoff Stud modules

This is a collection of modules for OpenSCAD that will create different-sized standoff studs with holes for a heat-set insert to be placed into them. I have created modules for various sizes of standoff studs. I am still very new to OpenSCAD. While it has been around for many years, I first heard about it exactly one week ago. For the type of projects that I work on, and the way my brain works, this appears as though it will be much easier for me to design with as compared with the commercial product Fusion 360 that I started out with.

Many of my designs are for cases to hold electronic projects, so I will need to create designs for holding circuit boards that have screw holes in a variety of places. To make installing, removing, and replacing parts easier, I like using these brass, heat-set, threaded inserts. Depending on the project, some times I need tiny little M2 screws and other times I may need a screw up to an M5. Each hole for an insert has an 8° tapered edge, to facilitate