How do I insert the screw hole into the component at the 6 markings, and remove the unnecessary geometry.
I am using Skechup Make 2017.
I am using Skechup Make 2017.
John, take a look at the bottom. It’s a mess of little frustums that the moved component doesn’t cut. A lot of cleanup remains!
I erased the top circles and edges, leaving only the guides.
Then I used Outer Shell to combine the small pyramids with the main model.
Then I split the hole component into a cylinder component and a “screw” component. Made both a bit longer than needed.
Added the cylinders in place, again, with Outer Shell
Substracted the “screws” to make the holes
Push-pulled the bottoms of the reinforced holes back to the bottom level of the model.
Presenning hulforstærker 06.skp (351.6 KB)
I didn’t even think to do that. Will have a look now out of curiosity.
OOPS!
Ansii seems to have the answer.
I followed him in using Outer Shell to unite the small pyramids with the plate.
I tried subtracting or trimming just one long cylinder using Eneroth Solid Tools, but it didn’t put cylindrical walls back in the base, and left a non-solid group.
Fiddled about a bit, but then gave up.
I watched this video on the SketchUp Essentials YouTube channel awhile back and wondered why I should struggle with manually creating geometry when these great extensions exist. And yes, I know the answer: using native tools make us better SU modelers. 
However, when I look at this problem, I wonder what the result would have been.
Hi! I’m sorry to tell I can’t open the file in Sketchup Make 2017, which I am using.
My I ask you to save in a Make 2017 compatible file? Please.
Here in 2017 format.
Presenning hulforstærker 2017.skp (575.7 KB)
It’s easyer for others to help you if you complete your profile with that information!
It’s easyer for others to help you if you complete your profile with that information! Done. 
1 Like
I thank you many times for your fine work. The task was far more difficult than my Sketchup abilities allow. I’m really grateful for your help. 
To really show your gratitude, you could mark @Anssi 's reply as the solution, rather than your own reply as the solution.
2 Likes
Done.