Unfortunately all the install videos show people tightening from above. Mine didn't crack, but after I perused the manual I saw that it says to tighten from below. It is a lot easier from the bottom. I was able to secure them better without the fear of breaking them.When you're tightening them, only tighten them from the underneath. If you twist the top pipes, they'll crack in a heartbeat. I learned this lesson the hard way.