What is the advantage of the “SRM” (Slow Retract Mechanism) over the regular kind?

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The SRM mechanism allows the screen material to retract back into its metal casing unassisted without getting damaged by a rapid ascent which would happen in a regular manual projection screen. For this reason, the SRM prolongs the operational lifespan of the screen. It also acts as a safety feature since the rapid ascent of the spring (non-SRM)mechanisms of older manual screens can occur with enough force to unseat the screen from its installation causing it to fall.