I tried looking for an adapter that would fit a standard plate holder but was unable to find any so I made my own and decided to share it. this adapter will fit on most standard plate holders and convert it to hold olympic size plates. the bottom 3 inches are made to be a friction fit on the existing pole and the length of the hole is 8 inches because thats the most common size for standard plate holders. If anyone wants to improve on my design I would love to see what you come up with, maybe custom design patterns or a better fitment system. I would be happy to provide more files if they are needed or print profiles for different materials. My version was printed in PET-G but i think ABS would work out better and ill be working on a print profile for it.