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It was the "apparent" high quality of the JAX lifters that persuaded me to purchase them.
They are unlike other adjustables in that the screw is much larger diameter than all the others. I did notice they did seem a little too easy to adjust. I am going to remove them today and see if I can "distort" the threads to give them a more interference fit and use red locktite. These were expensive and I hate throwing my money away!!