I created this project to protect the PTFE pipelines in our BMCU. It not only protects the pipelines, but also the spring mechanisms connected to the M4 connectors themselves, preventing excessive wear and scratches. The entire assembly is installed using a press fit. The bushings do not require glue, but it can also be used. To assemble the entire BMCU, we need a threaded rod about 150 mm long, and the entire assembly is fixed with two M6 nuts.