yep, celt. nice one.
I saw an interesting documentary once, about a stone age tribe in the rain forest, a crew filmed a native chopping down a tree with one.
His handle was like a large softball bat, with a tapered notch cut near the end that the poll fit into. It explained why that end is tapered, as it is used, the taper keeps the stone tight in the handle.
he chopped the small tree down much quicker than I expected.