I jettisoned the stock Stolmen feet because they look cheap. I kept the built-in threaded tube ends however. So I only needed new tube ends for half the project. Due to Ikea's lack of schematics, it was a challenge to determine the exact interior diameter of the pole with the tools I had on-hand. I decided to use DrillSpot's selection of S&W TE1-1B Tube Ends at 1-1/2" diameter and 1/2"-13 thread size
. They are actually a hair too small but using double-folded paper rings as a washer kept them in place securely. I wrapped the paper just below the exposed top and stuffed them in.
1-1/2" tube end: $8.16 each