Recommendations for a stainless steel flaring tool

I've got the Eastwood tool and it is super easy to setup and use. I struggle with double flare on cupro-nickel 5/16" fuel line with the standard type flare tool. Half dozen tries and still leaked. Eastwood version got it right the first time. I'm sure it was my fault, but it makes a dullard look good. Don't think I'd want to do SS without a more robust tool though, especially 3/8"