Here is how:
Step 1: Start with a small soup can (the small one is almost perfect in length and diameter).
Step 2: Open the can and make soup.

Step 3: Cut a slit down one side of the can, so that the can will tighten down evenly on the PTO assembly.
Step 4: Place a hose clamp on each end of the can and tighten down starting with the end closest to the tractor.
Warning **** You will want to round over, burnish or fold over and crimp the cut edges so that they do not cut the operator.
Other variations are below:
No slit, one clamp
No slit, closed end, one clamp