[burnin oil]

Mongo. For that style of flaring tool there is a puck with a stud on it (one for each size line). You start the flare and then put the puck in and it will have the double flare afterwards. They work decently on steel line but have a tendancy to crook on really hard line. That Nickel Copper brake line flare really easily. I actually started to under flare the seat a couple of degrees and let the fitting itself finish the crimp. It was to easy to actually over crimp the end and have a leek from the flare being to thin!