Lopsided balls!

[nammie]

I'm embarrassed to ask in case I'm being really thick but when you ball up the end of a piece of wire (Sterling silver in my current case) do you get a nice centred 'ball'? Or, like mine, do they sort of end up on one side of the wire?

I can tweak them central with round nosed pliers, bit like you would with a wire loop, but if everyone else is getting them central to start off with I'd love to know what I'm doing wrong! Any thoughts out there?

Nammie

PS I'm using a little butane torch and holding the wire vertically with the end hanging in the hottest part of the flame. I've tried with and without borax flux, I just get smoother lopsided balls!