Flare Tool
No question, Try to borrow because if it is good quality and you do it right, it may be the last time you have need. Light Plane Maintenance(I've subscribed for years and highly recommend even though all topics don't relate to experimentals) rated flaring tools in the November,2010 issue(nothing new since then). the Weatherhead was rated as best and I was lucky enough to borrow this tool. It makes beautiful flares easily. The cost is the hard part at $744. Aircraft Spruce sells this and two that appear the same for $300 and $80 that I believe you can return if you aren't happy with the outcome. The most important tool, per the article, is a good tubing cutter. Aircraft Spruce has a very good, Imperial Brand, cutter for $30. Don't go cheap here. The hard part is bending the tubing in the right places so the tube goes through various grommets, etc. Plan on buying extra tubing as you will throw some away. Hope this helps. Ken