Steady girls....steady.
Maureen, mandrels tend to get bent over time so if you have a 12 inch you can lop the bent bit off and still have a fair sized mandrel, it would mean your a bit further away from the flame to begin with.
I started off on 1/16 size but I much prefer the 3/32 now, they are far sturdier and give roomier working holes
Hope that helps
