My house is also over 100 years old with unfinished (i.e., I stll have to wax and buff) hardwood floors and plaster walls. I have nothing under my chair, roll from machine to machine. Have no damage to my floor. I use those round pads for moving heavy furniture under my larger pieces like my cutting table. I also use command strips/hooks to hang things on the wall. I recently removed some that had been up for over a year with no damage to my walls.