Thanks guys

Forgot to mentioned that the blade is one inch wide.
Actually, that is why I cut the original knife to begin with. It was too long and too narrow to be used and I was not surprised when I saw it in some drawer and someone told me it was there for many years unused.

Anyway. It is now only a 4 inch blade and very useful for general utility chores around work. I intend the removed part of peronal utility chores around the house or during camping.

I didn't think of inner tube. How wide should it be and if there is any video clip to show it I will appreciate it.

I know, I know, it's so simple and need no video, but I am getting old .. LOL