:/ Its all about trial and error my friend. Use a pretty snug tube. For my yzf600r, i use a i think 13/16 tube, and just bleed em. I mean you can screw up if you look at your reservoir and you bled all your brake fluid out. Your going to have to start all over then. I mean you can buy a tool, but technically speaking, to use the tool, your going to have to do it manually.