I had a problem that I caused stripes to walls when vacuuming.
I created a small adapter which can be fitted inside the vacuum clearner pipe. as the plastic is softer than the metal it causes less scratches to the wall when vacuuming top of the baseboard.

As the adapter has smaller diameter than the outer diameter of the pipe it does not interfere with other adapters put to the vacuum pipe.

Fits snugly to a pipe with outed diameter of 28,73mm

Printed in PLA. Maybe some softer material would be safer still for the walls.