Adjusting eccentric nutsm finally after suffering a lot of mistakes and wasting material, I found a solution for avoiding, eccentric nuts get tightened, I used another nut over the eccentric nut, and a washer in the middle, no more; the additional nut and the washer press the eccentric nut, So that the nut does not loosen.
Do u have a link for an online shop, the same reference, didn´t find “extended shoulder”
https://www.amazon.com/Eccentric-Spacer-Full-Size-Wheels/dp/B0197CCUIG/ref=cm_cd_al_qh_dp_t may be, these are extended shoulder?
I also added the extra nut without the washer and so far no problems
once there you can choose the extended shoulder from the list.