Torsion Spring 4" Residential Standard Lift Cable Drum Low-Budget-Shop How do I know they

How do I know they are locked in place

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Torsion Spring 4" Residential Standard Lift Cable Drum Low-Budget-Shop How do I know theyStandard Lift Residential Garage Door Cable Drum Set Torsion spring cable drum set for use with 1" torsion tube shaft. Left and right drums Sold individually and as a pair. Works with doors up to 8' 1" tall. Tech Specs: Standard lift up to 96" For 1" Shaft 1. 010" Bore Maximum cable size: 1 8" Capacity: 265 pounds per drum Cast Aluminum Includes set screws red Compatibility Torsion spring systems matching tech specs