You could upload just the image directly into the forum here, without needing a link to Imgur.
Here’s what your model looks like, as a direct image upload.
You could accomplish it with solid tools, but these are only available to Make users during the 30 day trial period when the Pro Trial allows you the full use of Pro-only tools, of which Solid Tools is/(?are) one.
What do you want to do with the model when finished? 3D print it? If so, and to make it easier to edit, you need to make some changes to the way it is made.
I’d suggest amending the way you model components. If you Hide rest of model as you have done, you can’t see, or make inferences from, other parts of the model while you are editing it. Untick that box in Model Info/Components and just used a level of Fade that your are comfortable with.
Normally edges coloured red indicate either that they are locked, or that you have Colour by Axis turned on in Styles, and the edge(s) that are parallel to the red axis are turned red. You have Colour by Axis on, but even when I change it back to All same, they all stay red. I copied your model into a new one to look at it without this confusion.
Your outside ‘ring’ has reversed face showing blue. Double click on the ring to open it for editing, select all inside it by a triple click, and choose R-click/Reverse faces to fix that.
Intersections, rendering, and Solid tools don’t work well with reversed faces.
To make the edits in Make, if your Pro Trial has expired, you can use Edit/Intersect Faces. Follow the instructor, or look at Sketchup Fundamentals at learn.sketchup.com for the details.
You’ve scaled up your model which is sensible to avoid problems with short edges in SU, but you are using far more segments that is necessary and you are getting some short edges as a result, when I first try Intersect faces to edit the geometry.
Use a consistent and smaller number of segments for your segments and arcs, and make them a multiple of 12. That makes it easy to align a radius with the red or blue axes, and to get an equal number of segments in all four quadrants. You circular ring uses 100.
I tried to change that, but I see that the edges of your ring are curves, not arcs, so I can’t just change the segment numbers as I could if it were a circle.
I tried to redraw it, but it doesn’t seem to be any particular size in either mm or inches.
And almost all of the rest of the geometry of the components has multiple loose edges, not arcs or straight lines so it is very difficult to make the edits you want. It’s possible, with some plugins, but not that easy using native tools.
It wouldn’t be that difficult to redraw from scratch, and that might be the best way to proceed.
I’ll have a go, but it may take a while as I have other things I need to to before bed. Tomorrow, if not tonight.
Think that might do more than anything to teach me how to make more successful models.
