How Does Using ##m## Instead of ##M = 2m## Affect the Seesaw and Spring System?

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hang
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Homework Statement
seesaw
Relevant Equations
torque
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The question ask to find torque about the pivot point S.
I first find the torque due to gravity of the plate and then torque due to spring force.
I understand that the weight of the rod do no torque as it is acting on the pivot S.
Where have I gone wrong?
 
Orodruin said:
You used ##m## instead of ##M = 2m## for the mass of the disk.
thank you so much
 
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