As a mechanical engineer I still attempt to keep my hand in with design tools and particularly 3d design. Over the years I have moved from expensive desktop based software to browser based tools like Onshape. The designs I do on there are all public and may be of interest if you want to fork them and make your own adjustments. Additionally I have .stl files avalable for 3d prinatble parts that are on Thingiverse

I have mentioned before in a blog post about 3d tools such as FreeCAD so will not go into detail here but will go into the basis of design of any of the parts in seperate pages

Paint Pole Mast Adapter

Paint Pole Mast Adapter

Lightweight paint poles make great push up masts for field day or backpacker contest type activity. The poles generally have a threaded end and are a variety of different threads from ACME to ISO and tapered in between. This adapater is for...