I love seeing how other people do things but more detail would be helpful. I have tried with some success and a lot of failure the Tracy Mickley measurements (length of tube and diameter of countersink relative to the thickness of the overall handle). I found it too hard to get exactly right so as of yesterday I am a new graduate of the Fairly School of Flaring. What I like is to keep it as simple as possible. I countersunk the holes with an 82 degree bit to an outside diameter of 3/8" for 1/4" tubes. Saturday I epoxied the tubes and the handle together with little regard to the length of tube sticking out. Q-tips and acetone were the hardest part but necessary to keep the epoxy from hardening in the countersink. Yesteday, after it set, I cut off the tubes with a port-a-band close to the handle and then sanded the tubes flush to the scales on a flat platen to 400 grit. The only tubes I had around were thick walled 304 so I was worrying about splitting. I lightly flared the inside of the tubes with the 82 degree bit and flared them.
There are so many different ways to do the same things and the results will vary on the method used but for simplicity sake I think I like how it went.
I'd love to hear how other people do it too.