Did you orient the washer the proper way on the end link? Cause if you do, then when you tighten the nut it will pop onto the step and it will be tight. If you don't position the washer correctly I could see how there would be play. My HKS end links came with locknuts and don't see how they would back off. Also, install the lower bolt on each side with the top loose so you can rotate the roll bar as you want.
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