I bought a Draper flaring set, it was about £30. It works well but getting the pipe stuck out of the clamp the correct amount is critical. I found if I had the thickness of an M6 nut abouve the top of the clamp they flared really nicely.
Are you holding the pipe clamp in a vice when you try to flare it? I found if you try to do it without you can't keep the flaring tool upright.
Cheers
Dave
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