When floating brake lines it’s a process 1.Cut the tube with a tube cutter ( not a hacksaw, cut off wheel etc.) 2. File the cut end flat, I put a file flat on the table and run the line accross a few times to get rid of burrs. 3. Ream the hole ( the tube cutter pushes some material inside when cutting) 4.set the line correctly in the holder to start forming the flair. ( for the first step the line should stick up out of the holding tool the same amount as the die is thick) 5. Install the die and press it down ( I put some brake fluid on the die as a lube, seems to help. 6. Remove die and flair the crushed end with the flair tool. 7.done 8 SHIT !!!!!! Did I forget the fitting again !!!! Gatdammit every frickin time !!!! Been doing lines fir 20 years and it still happens ...... a lot !! I have an old imperial flair tool and a snap on one both old and work well Check swap meets etc for older tools for cheap. Practice make sure perfect, you can’t run if you never learned to walk.