Review on National Hardware N179 820 4005BC Smooth: Enhancing Safety and Efficiency in Your Projects by Brian Whitmore

I liked the price but I got what I paid for. The pole wasn't straight, and the ends were curved, not even remotely round. I had to file the edges to create a cone and use PVC pipe along with a rubber mallet to push the rod through the bearing blocks. Not even close right now. I use this for the rocker arm and turning the rod noticeably moves the plate up more than 0.25" or so. If you don't need it directly then it works fine, but I had to pay the extra money for a linear one Spend shaft instead of rod.