One day when doing an automotive oil change: I purchased oil and a filter, drained the used oil, and then discovered my brother had the tools I needed. I had no strap wrench, filter wrench, or filter pliers. I had to get the car running prior to him returning.
It is always best to use the right tool for the job, but what was I to do? IMPROVISE!
This is how I used an old belt as a strap wrench...
Step 1: Proper Belt Selection
There are some recommended attributes the belt should posses.
--> Strong buckle -- The best type of buckle to use is one where the frame is a solid piece. Reversible belts may rely on a mechanical pivot that could fail in this application.
--> High friction strap -- The belt I used had a leather strap. The front was smooth and shiny, while the back was rougher and unfinished. Again, a reversible belt with two smooth sides may not be a wise choice. I do not know how a webbed belt would fair.
--> A strong strap -- The strap must be firmly attached to the buckle and be able to handle the force applied.