Hello, I received a SW file from somebody else. In that model, the parts cannot be moved. I would like to modify that model so that the shaft can be extended and retracted. To do it, I plan to create another shaft with a tip that has the same design as the original. I clicked on the tip of the original shaft and pressed "control". When I tried to drag, I got a circle with a line across it (that icon means No). How do I copy the tip part in this case?