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Remembering back to college, 33 years ago. We used to use a tool to form compression rings on copper tube. It worked on 15 & 22mm, had a "t" bar handle and was inserted into the cut end. This was then turned and a ball bearing was forced out.This made a ring for a compression fitting.
have never used or seen one since.
can anyone remember them. Or why they were called?
have never used or seen one since.
can anyone remember them. Or why they were called?