I did the same thing... When I was an admin/moderator whatever I was getting into political arguments in the bar and thought it unbecoming for someone of authority to be waving around flags or personal opinions. Strangely though, I pretty much stopped doing it after I resigned my post. Perhaps, like me, he'll stick around even without the title. Hope so.
Your arch arc isn't on an axis - it's slightly off.
This is itself mightn't cause an issue, but if you pick points locked axially it could be a problem...
Try recreating your arch arcs parallel to the the green/red axes, find the center point and re radially array the 'dowels'...
Under the extensions tab, you can only activate already installed extensions. These extensions are generally plugins written in a simple text format with a file extension *.rb (sometimes *.rbs) referring to the file type " ru by" (the scripting language of SketchUp plugins).
Some more complex plugins may contain other file formats, too (like images for toolbar buttons) and are generally placed inside a *.zip archive that you need to unpack to the same place where you would install *.rb files.
In SU 8, there is a possibility to rename this *.zip archive to *.rbz (or " Ru By Zip") and directly install the extensions/plugins with this "Install extension" button (i.e. you need not go to your Program files... > ... Plugins directory to manually copy/unpack files there). But you only use that button for these *.rbz files.
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