- The Neiko wing nut broke after a few use.
Went to Lowes hardware and bought some M8 x 1.25 bolts and nuts.
The Lowes nuts are much better than the wing nuts from Neiko.
See photos for detail.

- Soon or later the serrated or threaded portion of the tool will strip
due to the force from making bubble flare. Toward the end, the tube just
slides in the tool, making it useless.
If anyone has any trick to make it alive again, please let the rest of us know.

In retrospect, if I had used the Lowes nut to start with, the grip is tight
and I did not destroy the clamp serrated edges, which rendered the tool useless.
So yes, get the nuts at Lowes way before the job.

- Technique:
* Clean cut is a must.
* Deburr the inside (I use the wood drill bit shown). I use my hand to deburr. Do NOT use an electric drill here.
* The chamfer: use a file and chamfer the outside to 45 degrees.
* Before installation, blow inside the tube to make sure no bugs, debris are inside.
* Use a drop of oil wherever there is friction (on the tool bolt threads x 3, and on the 4.75-mm adapter where it contacts the pipe).
* When making the flare, make sure the tool is as straight as possible.

Attached Images

          

__________________
1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT