I am trying to run a sensitivity analysis between the length of a crank shaft and it's max_stress_vm. However when the simulation runs and the length is increased an extruded hole does not move along with it. I am just wondering if it is possible to make a sketch reference a difference point so that when the length is increased it maintains the same distance between its centre and the edge. 
I want to ensure that the black circle is 10mm from the green co-ordinate system rather than being 100mm from the original co-ordinate system.
Thanks for any help.
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