I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base upon which I write this question is fairly low.
I'm trying to rotate a hollow bamboo gardening stake (30cm long, 2.5cm diameter, denoted by B in the image below), with a servo motor. I plan on mounting the servo with a rounded mount (denoted by A) that will be printed to fit snugly inside the stake. There will be "fingers" attached to the gardening stake (represented by the light grey cylinders) upon which a PVC cable will rest (represented by the orange line). We will be hanging some light objects (max weight 0.15kg /item) on the cable, between the cylinders.
The goal is to rotate the stake such that the cylinders move from position 1 to 2, and the cable slides off, then rotating the stake back to its original position.
I've done some reading about torque and think the calculation I need to perform is summing the torque required to turn each weight (or force) hanging down on the cable, for its respective distance from the servo. Alas, being a newcomer to the world of physics and engineering, I have no idea if that's right, and prefer to try and be precise than overcompensate by purchasing unnecessarily powerful servo motors.
How would I go about determining the torque required by the servo motor? Or does a simpler design exist to create the desired motion, that I've not thought of?
Thank you in advance.