What Steve said in post #11. The first step of a double flare is the hose barb. If it's something you're only going to use once or twice, get one from Harbor Freight. If you think you may use it some more, step up and get a better one.
Tried a HF one first and it nor the NAPA would hold the tubing in place to make the flare. And I had them cranked as tight as possible. Cranked clamp sides completely together tight and flat. I have been down this road more than once. I needed double flare but you might get away with the bubble portion OK with that style. BTW, the hydraulic I bought has complete replacement parts list with it too.
