whilst jacked up with both wheels off the ground, and with the steering lock disengaged , the steering wheel will spin , and when it gets to the end of its turns it will bump. Mine has always done this . Have you any play on the inner or outer tie rods ? you should be able to feel this by hand. You will also notice a zero movement of the roadwheels each side as you move the steering wheel side to side if there is play. it should be very positive when you move it, and show at the roadwheels a positive response.
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