The doors hadn't been sliding smoothly for awhile and my parents contacted Mr Handyman Toronto Central. The guy seemed to be clueless. After taking the doors down, he put the greasy bottom on the carpet and had to be asked to move it and clean up. He discovered a cracked wheel which required a trip to Home Depot.
He said he had some netting in the truck and offered to repair the screen door. Once he started, he realized he did not have enough material. Off to Home Depot again.
Finally he claimed the reason the door was no longer snug was because the frame was bent. It was pointed out to him to lift the rubber guard and things slid back into place.
Several hours later the job was done and the doors now slide better.
Use them again? Not a chance