Spoolholder Mount with 15 or 19 mm Pipes for IKEA Billy

I was looking to leverage my Billy Bookcase to convert in into a place to store my opened filaments and at the same time keeping them dry. Stage two is to add some doors.

I did however not want to screw into the existing holes and use the existing inserts. Hence I came up with the following design for 15 or 19 mm Pipe. Pressure fit. I also ensure a spool can be placed against the wall to use every available mm