How to use screw mate if I want to start the motion of nut on lead screw from particular point.

I am using screw mate between nut and lead screw. screw is rotating and and nut is translating linearly on screw. but, when I am running motion study it is not starting motion from the point I want to start. So, can you please tell me how I can start motion of nut from a point I want.

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