Official Answer
Answer
Installing a multi-turn spiral ring in a deep bore (e.g., a hydraulic cylinder) requires the ring to be compressed to a diameter smaller than the bore. Because the ring consists of two or more turns of flat wire, it behaves like a very stiff spring. Using a 'tapered plug' is the most effective method: the ring is compressed as it is pushed through the plug into the bore. The main challenge is 'scuffing' of the bore's polished surface, which can lead to seal failure. To prevent this, rings are often lubricated with assembly oil or coated with a dry-film lubricant (PTFE). Additionally, the installer must ensure the ring 'snaps' fully into the groove, often verified by an audible click or a visual check with an inspection mirror.
