Yesterday I installed a new strut on the front left of my '84 Reliant. I tightened the nut as best as I could when the assemble was off the car. It is hard to wrestle with but I tried everything. I even put the flat at the top of the rod in a vise while I used an offset box wrench on the nut. I was told not to use an impact wrench because if the rod took to spinning this could damage the valving in the strut. Everything is back in place. I thought I could tighten it more when it was installed since I wouldn't be fighting so many moving parts but that hasn't helped. It makes noise on the road and this is the only thing I don't have complete faith in. The same issue came up in a post from 2012 and the answer was: "Hold the rotating strut rod with a 10mm and then tighten the nut." Where would the 10MM be used? Any other ideas? Dare I use an impact wrench? Thank you all always, Justin PS. The car is rust free with only 53,000 miles. The old strut was a pristine piece of mopar but deader than dead.