I have another method but I don’t recommend!
Cut a small piece of the chair, enough to get the curvature. Trace that and glue it back on, do it in the back area where no one can spot it.
With a tool like this.
I managed to sketch the circular shape that fits in the groove by using the stl, so that is progress!
I’m honestly completely lost as for how to move on from here. Attached is a picture of my ridiculous attempt. I’ve tried to sketch the shape of one side of the adapter, and then sweep it along a path that is matching the slope and length of the actual adapter.
I have also tried to union them and remove the bodies that ‘stick out’ but it’s not working out. Are there other solutions to this? If I’m on the right track I’d love to know, maybe it’s the correct approach, I just need to fine tune my skills? Or, the more likely, I’m on the wrong track.
Post your picture, its missing but I think you are at the stage where you want to sketch the leg now so you can subtract.
Genius!
Did you sketch the actual leg, or use the STEP file posted previously?
Also, I’m curious how you did the rest of the model on the picture? Did you create a solid block and subtract the chair leg from it?
That I just drew it because it was faster but it would be the same approach.
You can work with the STEP file, because it’s a conversion its not clean you want clean it up.
Also figure out the angles so you can have straighten versions.
Honestly, quite confused still.
I’ll give it a shot, thank you very much for taking the time to help out!
I cleaned up the leg and have the bracket subtracted, test what you need with this file.
It’s harder to work with because the leg is at an angle. Also instead building up the bracket, subtract a basic block off the chair and you can cut away to make the bracket you want.
Here is Parasolid file for Arron 
and a Shapr file too.
chair.shapr (15.0 MB)
chair.x_t.zip (4.6 MB)
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Ok, I see where you’re going, but I’m still a bit behind. Feel like I’m bothering you way too much, so at any point, feel free to not respond.
Don’t get me wrong, I appreciate the file, but I would like to be able to do this myself.
I imported the STEP file of the chair, and simply just cut off a single groove from it to use as a basis for the rest of the design. You’ve mentioned that you cleaned up the model, and I can see from your attached file that the cutouts you have only have a few faces, mine have MANY (see attached). I tried to ‘replace face’ but that had no effect. I can’t simply delete the edges, so I’m at a loss.
Also tried to subtract the body from a simple rectangular body, but the result is the same, I’m left with a bunch of face which is a bit hard to work with.
Not quite sure exactly how to obtain the final shape that I want, simply by ‘reducing’ the body over and over, but I think I have a slight idea at least.
On MacOS I found this tiny gem to be a tremendous help going from photo to drawing. Even as a ruler side-by-side, or counting at translate pixel measurements.
PixelStick PixelStick – Mac App To Measure Pixel, Angle, Color Onscreen – Plum Amazing Site or appstore
Photoshop works too if you have it.
If you import the pic into shapr and draw 2 rays from a point over the pic it will tell you the angle below.
If you take a reference measurement, you can scale the pic to match a line segment that is the length of that measurement making it easier to draw over and visualize your project.
I have found that imported models also import their geometries. the triangles you see indicate an STL or OBJ or similar type of model. Shapr doesn’t play well with them. They are not like “parasolids” which is it’s native format.
Mr SCALEMODEL actually recreated the vertical strut in Shapr which will net you cleaner geometry to work with.
I would measure the struts thickness and width, determine the angle with an imported pick, then reproduce the vertical strut at the correct angle to begin modeling and adaption that works with it.