Smart Servo Motors used in Houdini's Stage Mech.These come pre-calibrated for the stop points.
The Disappearing Ball (captive ball) servo, will come with a captive ball attached.
The Curtain Motor should be installed with closed door.
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Curtain Servo install video: https://youtu.be/9XEynT-sl_M
Captive ball install video: https://youtu.be/2Uy5qU0zOyc