WeldConstraints rotating other objects

Hey everyone, i am making a remastered deathrun, and i have been making a few recent traps. First off, i have gotten a saw trap, that moves down to the surface, killing the player once a button is pressed. The saw is supposed to be spinning, but here is the main problem.

The whole contraption is a model, mounted on rails, however, the model is tweening down. Therefore, to make models tween i am using WeldConstraints against my Primary Part because there is no position property in a model. There is a mesh, as a blade of the mount, and it is supposed to spin. But after i scripted the spinning part, the whole model spins with it

Image of model:

Is there any way to fix this?

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In place of the WeldConstraint, use a HingeConstraint, set it’s ActuatorType to Motor, set AngularVelocity etc an watch it spin. It will require an Attachment on the Model and on the Saw blade. The Model tween will then just move the saw with it due to the attachments and Hinge. You may need to play with the various properties (velocity, Torque etc.) to get a good spin from it.