I don't think I would worry about castle nut or nylock, both will effectively do the same thing. Unless it's just a must have for you. Certainly is better than what your scamchanic did. As long as you have something that locks into place, and looks correct, I personally think you should be good.
My wife just brought up a good point, if your scamchanic also did the lift, please, for the love of God, have someone please check over everything he did. I don't trust him, and neither should you.
My wife just brought up a good point, if your scamchanic also did the lift, please, for the love of God, have someone please check over everything he did. I don't trust him, and neither should you.




. Looking back I would have thought a machinist would have done that FIRST. He was a fine machinist but a poor shade tree mechanic. Since he damaged the new ball joint beyond being able to return it he had to purchase another one, which this time he measured it first. Steep learning curve. Yet it was a great learning tool for me because I don't want to make the same mistake! Several years ago I had a pair of front brake pads that wouldn't fit. A/C Delco no less. The calipers made for quick measurement to see the new pads were a bit oversized and a file made the pad factory sized 


