I have a metal sheet formed helmet hanger, which has chamfered edges, but it might still hurt my helmet. :)
So designed a part to fit and cover the 3.50x20.50 mm profile with a gentle touch.
You can scale the part, to the profile you have, even the curvature is modified, it still keeps a rounded touch to smooth contact area.
MY Part Number : MY.OR.HLMHT.1
View all: https://mesut.me/3d
The author marked this model as their own original creation.