I know nothing about the solidsteel racks but having designed a few racks of my own, more than likely what you've encountered is a machine shop that neglected to clean out the threaded parts of the points so all the grunge from the tapping is stopping you from completing the threading.
Try running the internal threads on the points under warm water to thoroughly rinse out the internal threads and you might also get a damp paper towel to clean the threads on the rods.
Hope this helps,
Try running the internal threads on the points under warm water to thoroughly rinse out the internal threads and you might also get a damp paper towel to clean the threads on the rods.
Hope this helps,