The material was changed to Stainless with the last run of adjusters, this was primarily for the purpose of eliminating any possible corrosion. When I talked with my steel supplier about changing materials they let me know the strengths between the old and new EOE adjusters is virtually the same. I knew someday there might be a failure at the threads if the situation was just right, it's good to know the chamfered edge where the threads start was not a weak link and the adjuster did not break in half.