I have a home-made 5/16 tool which works great. When I went to 3/16 tubing, I bought a LOAC. It works better. 3/16 tubing has issues by the nature of the size. To me, it is definitely harder to work with than 5/16 but the LOAC tool makes it easy. I cut a small section out as it tightens the line somewhat as I go along.