A: I had trouble until I read the instructions and saw that you only need to have it stick through the dept of the doubler tool's step. After that, I haven't had a leak (I also put mine in a vise) From: Bob Johnston <shadowmask70@xxxxxxxxx> Subject: Tips on double flaring brake lines? To: mail@xxxxxxxxxxxx I'm having trouble getting a seal on my double flared 3/16" brake lines. I filed and chamferred inside and outside of tube etc. Flare looks good, but leaks under pressure. I did search and saw some of the cheaper double flaring kits can put flare off center. Wondering if any list members had success with the lower end double flaring tool, and how they did it? Thanks, Bob.