VO wrote:

Paul,
How it is works? What is for?
Vlad

Have not had a chance to try it yet but you grease it up and insert it
in the end of the tube you want a bead on. Then you turn it with a large
wrench on the hex while slowly screwing in the bolt. The three balls
press the metal outward forming a bead in the end of the tube. A hose will 
not slip off when a hose clamp is tightened down around it.

Paul Lamar
 
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