My response is "I will teach you to do it, so if I am not available the next time , you will be able to do it your self" , but I don't "take in" mending projects.
Somehow they never seem to have the time to learn. Gee.... if they don't want to spend their time, but expect me to use my time, then the request was more to get something for nothing or next to nothing.
I have has a few say they wanted to learn .. guess what ...I turned them into quilters .