just turn them - don't worry about the sap - when you are done, see how
they
dry - fir can be pretty particularly in larger sizes and you can turn it
pretty thin if you want - or leave about 1/2 inch thick so the heft
matches
the size -

Oh, I'll worry about the sap alright - just handling the sections gets my
hands covered. I'm worried about it flipping in my face while I turn! : )

steve