Recently I was left with a presta tube for a schrader rim. I decided to have a go with the nut on the inside of the rim to protect the tube from the extra space there.
I know I can get a little adapter to put in the hole for this exact reason and I plan on getting some today. At the time it was either what I did or nothing.
I just wonder if anyone else has ever done that. How bad is it? Should I change it right away when I get home with the adapter tonight, or will it be fine as is?