The scar is clearly located in the lower half of Copenhaver’s upper arm.
from the following video at 3:06
@phiphi-the-frenchie @flamecensor
The lower half of his upper arm was below the railing.
Also a good photo to determine Copenhaver’s position. The distance between the two stars can be used for this.
It fits, Copenhaver stood between the left point and the two right points. But you’d better calculate it yourself, perhaps with the help of your CAD model.
What is your opinion on the holes?