They can be mended in a jiffy. Reknits the original stitch."
"The only mender which can be operated by an amateur."
Really? Read these instructions and I dare you to figure out how to use this thing. It starts with a small wineglass...and you'll need a large one for drinking by the time you get your first nylon repaired.
Remember, "Now lay mender down while you stretch the runner as tight as possible lengthwise - but not crosswise. This is the most important part of the operation."
But if you cannot work this, "You are not completing your stroke clear up and clear down."
I think I'll leave it there.