To protect the PTFE tubes in our BMCU, I created this project. It protects both the tubes and the spring mechanism itself, to which the M4 connector is screwed, from excessive wear and abrasion. The entire assembly is press-fitted. Glue is not required for the bushings, but it can be used. To assemble the entire BMCU , we need a threaded rod approximately 150mm long, and the entire assembly is secured with two M6 nuts.