Jack up the front end and put a pair of stands under the lower suspension A-arms. The steering wheel should turn from full lock either way with no stiff spot at the midpoint. If stiff across the centre point, undo the lock nut on top of the steering box and undo the screw 1/4 turn retighten lock nut and recheck. If the stiffness has gone, fine but you could try it 1/8th turn instead of a quarter to see if you can feel any stiffness. The screw has a very coarse thread so a small amount of turn gives a big adjustment. Report back.
Idler arm bush can cause stiffness and if the lower outer suspension ball joints are dry and greaseless they can make the steering stiff too. Stiffness in these joints will be less obvious with the wheels unloaded.
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