Need suggestion

We borrowed an infant car seat from friends for our baby. Its all been good, perfect for baby and we are about to return it back. Everything is good, but the car seat handle grip rubber wore off. It was good when we got it, but now that part has dents on the grip part. Its bad to look at it. Can I replace it by any chance? (Its really tight and I am not able to get it off) Or is there any handle covers available for baby seats that I can buy? Also, how can I explain this to my friends. I am feeling pretty bad, they gave it in a good condition and now I have to return this way. Please help and suggest how to deal with this? Thanks