Mapex B80 Armory Cymbal Boom Arm

Have four of these in use, two of them have developed a hinge at the joint where the upper lever connects to the boom arm (theres a hole visible in the photos with a tiny pin inside). Not sure if a manufacturing defect or just because of too much playing with the boom arms parrallel to both sides so that the cymbal swing wears out the joint. Still disappointed at the durability. In use for 2 years.