A recently tested experimental model of a Neolithic sleeved axe, based on an artifact found at UNESCO site of Hornstaad Hornle 1A, in Lake Constance, on the border of Germany, Switzerland, and Austria.  The underwater site was discovered in 1856, during the Early Late Neolithic(3,922-3,902 BC), when cultures were creating water edge villages on piles, and using ground celt axe tools to cut wood such as poles for dwellings.  This model features a 3.5 inch green basalt celt, which was ground here by hand in traditional method on sandstone slab.  It was fit into a large Elk antler cut, using the pithy inner section to fit into the Beech wood handle.  The celt was also fit into the pithy section, and it is believed the antler both absorbs shock and prevents splitting of handle wood.   This model performed very well in testing, and is shown in the videos above, first tested on soft dead wood.  Once the celt was well seated into the pith, and also given some pitch glue to prevent spinning in haft. It was then tested further on solid Birch poles about 2 inches diameter, and it cut at the rate of about a minute to get through them.  This lead to the conclusion that this would be a critical tool in creating dwellings as a one handed tool for smaller sized jobs.  It is being sold as USED and retired here for display, teaching collection example, or further testing, but still functional as it cuts now with no damage or cracks, and stone celt axe still sharp enough for small chopping chores.  It has already been used in heavy testing, so there is no guarantee on the future functional use with this item.