I wanted to love these but so many issues. All the safety pins slide in and out of the holes freely. The retaining balls don't even touch the sides of the holes. All of them slide around when you use the arms. Simply dangerous. Tolerances are loose at the pivot arms as well. Could be so much better if they made some changes that are very simple. Seems like they rushed these out the door. Unusable as they are right now for safety reasons.