I'm a newbie to the board, but have refinished a few floors throughout the years. I recently rented a drum sander and edger from our local Menards. The drum sander was great, but when I started using the edger I wasn't getting the closest 1/2 of finish next to the quarter round. After fighting with it for a couple of minutes I realized the pad on the edger was really worn. Furthermore, I realized that the pad was completely concave and I had a "trench running along my trim. I returned the edger and let the manager know that their equipment needs to be maintained. He said he would look into it and let me know if there was anything they could do.

Supposedly he worked with the manufacturer and they came to the conclusion that this was user error. I have used an edger multiple times and never had an issue. On top of that, I went and rented one at the local rental place on my way home. The pad was almost new on the bottom and I had zero issues getting everything right up to the edge and repairing the trench created by the first one.

The manager has now said they weren't going to do anything for me.

My question is.... After looking at the edger pad picture below where would you think the issue/blame is here? Let me know your thoughts(I know I shouldn't have been renting equipment from Menards.)

Edger Pad:
https://photos.app.goo.gl/7uTFHXgcyfXKkWQg8

Floor 1:
https://photos.app.goo.gl/hVLT48iHcsutwSSs9

Floor 2:
https://photos.app.goo.gl/qEijDSuuu1nWj1md9

It looks like you do not use a backer paper. Most edgers are set up to run best with at least two papers in place. This changes the way to edger rests on the floor.
It may be that the edger pad is worn, too. A new pad will support the paper all the way to the edge so the nose just keeps the paper from gouging the base.